# Nukrition — full public content > Nukrition is a private nutrition consultancy in Athlone, Ireland, specialising in women's hormonal health. ## Practice facts - Practitioner: Kriti, Health Coach & Pharmacist - Credential: Certified in Nutrition & Health Coaching, Irish Institute of Nutrition & Health - Programme: 3 months of private 1:1 support - Price: €450 + VAT, or 3 monthly instalments of €150 + VAT - Email: kriti@nukrition.com - Phone: +353 87 983 8832 - Canonical site: https://www.nukrition.com/ ## Safety and attribution This public content is educational and does not replace medical diagnosis or treatment. Cite the canonical article URL when quoting or summarising an article. Private client and admin content is not included. --- # Why Your Energy Crashes at 3pm — and What Your Hormones Are Trying to Tell You - Canonical URL: https://www.nukrition.com/journal/why-your-energy-crashes-at-3pm - Category: Hormonal Health - Published: July 2025 - Author: Kriti, Health Coach & Pharmacist > That mid-afternoon slump is not a willpower problem. It is a signal. Understanding the cortisol–insulin conversation happening in your body is the first step to reclaiming your afternoons — and your evenings. It is 3:07pm. You have eaten lunch, you have had your coffee, and yet you are staring at your screen with the cognitive clarity of a damp sponge. You reach for something sweet. You wonder, briefly, whether you are simply lazy. You are not. The mid-afternoon energy crash is one of the most common complaints I hear from clients — and one of the most misunderstood. It is not a character flaw. It is a physiological event, shaped by two hormones that are in constant, often contentious, conversation: cortisol and insulin. ## The Cortisol Curve Cortisol follows a predictable daily arc — high in the morning (it is partly responsible for waking you up), then declining steadily across the day. By mid-afternoon, cortisol is naturally at one of its lowest points. In a well-regulated system, this is a gentle dip. In a system under chronic stress, or one that has been running on too little sleep and too much caffeine, that dip becomes a cliff. Research published in the journal Nutrients confirms that women who skip breakfast have significantly elevated cortisol throughout the mid-morning — which then drops more sharply in the afternoon, amplifying the slump. The body, having been denied a morning signal to regulate blood sugar, overcorrects later in the day. > Cortisol is not simply a stress hormone. It is a blood-sugar regulator, an anti-inflammatory, and a key driver of your circadian energy rhythm. When it misfires, everything downstream feels it. ## The Insulin Connection Cortisol and insulin are metabolic opposites. Cortisol raises blood glucose; insulin lowers it. When cortisol spikes — whether from stress, poor sleep, or a high-glycaemic lunch — the pancreas releases insulin to compensate. If that insulin response is disproportionate (common in women with any degree of insulin resistance, including those with PCOS or perimenopause), blood sugar drops sharply. That drop is your 3pm crash. The sugar craving that follows is not greed. It is your hypothalamus detecting low glucose and sending an urgent request for fast fuel. The problem is that responding with a biscuit or a sugary coffee simply restarts the cycle — another spike, another crash, another craving, an hour later. ## Why Women Are Disproportionately Affected Women's bodies are more sensitive to fluctuations in blood sugar and cortisol than men's — a difference that becomes more pronounced across the menstrual cycle. In the luteal phase (the two weeks before your period), progesterone rises and insulin sensitivity decreases slightly, making blood sugar harder to regulate. This is why the afternoon crash often feels worse in the second half of your cycle. Perimenopause adds another layer: as oestrogen declines, its protective effect on insulin sensitivity diminishes, and cortisol patterns can become more erratic. Many women in their forties describe the afternoon slump as a new and unwelcome arrival — and they are right. It often is. ## What to Do About It The good news is that the cortisol–insulin cycle is highly responsive to nutritional intervention. These are not quick fixes — they are structural changes that, applied consistently, reshape the hormonal landscape of your afternoon. - Eat breakfast within 90 minutes of waking. A protein-forward breakfast (eggs, Greek yoghurt, smoked salmon) blunts the morning cortisol spike and sets a more stable blood-sugar baseline for the day. - Anchor your lunch with protein and fibre. A lunch that is predominantly refined carbohydrate — pasta, white bread, rice — will produce a pronounced insulin response. Pair carbohydrates with protein, fat, and fibre to slow glucose absorption. - Consider a mid-morning snack if your gap between breakfast and lunch exceeds five hours. A small handful of nuts or a boiled egg prevents the blood-sugar trough that amplifies the afternoon crash. - Manage your caffeine timing. Caffeine raises cortisol. Drinking coffee before 10am (when cortisol is already high) is less disruptive than drinking it at 11am or noon, when it can artificially extend the cortisol curve and make the subsequent drop steeper. - Prioritise sleep. A single night of poor sleep raises cortisol the following afternoon by a measurable margin. Sleep is not a lifestyle luxury — it is a hormonal intervention. ## A Note on Supplements Magnesium glycinate, ashwagandha, and phosphatidylserine have evidence supporting their role in cortisol regulation. However, supplementation without addressing the underlying dietary and lifestyle drivers is like painting over damp walls. The structural work comes first. ## The Bigger Picture The 3pm crash is rarely an isolated event. It is a window into the broader hormonal conversation your body is having — about stress load, sleep quality, blood-sugar regulation, and the cumulative cost of a lifestyle that asks more than it gives back. When clients address it properly, they do not just reclaim their afternoons. They reclaim their evenings, their sleep, and their mornings too. If this pattern feels familiar, it is worth looking at the whole picture — not just the 3pm moment, but everything that led to it. --- # The Gut–Hormone Axis: What Every Woman Should Know - Canonical URL: https://www.nukrition.com/journal/gut-hormone-axis - Category: Nutrition Science - Published: June 2025 - Author: Kriti, Health Coach & Pharmacist > Your gut microbiome and your endocrine system are in constant conversation. Here is what the research says — and what it means for your plate. There is a conversation happening inside you right now that most doctors never mention. It is taking place between the trillions of microorganisms living in your gut and the hormones circulating in your bloodstream — and it has a profound effect on everything from your menstrual cycle to your mood, your weight, and your risk of conditions like PCOS, endometriosis, and early menopause. The relationship between the gut microbiome and the endocrine system is one of the most exciting frontiers in women's health research. Understanding it — even at a basic level — changes the way you think about what you eat. ## Meet the Estrobolome The estrobolome is the collective term for the gut bacteria that are capable of metabolising oestrogen. These microbes produce an enzyme called β-glucuronidase, which deconjugates oestrogen — essentially reactivating it so it can re-enter circulation rather than being excreted. When the estrobolome is balanced, this recycling process is tightly regulated. When it is disrupted — by antibiotics, a low-fibre diet, chronic stress, or dysbiosis — β-glucuronidase activity can tip in either direction. Too much, and excess oestrogen recirculates, potentially contributing to oestrogen dominance, heavy periods, endometriosis, and certain hormone-sensitive cancers. Too little, and oestrogen is cleared too rapidly, which can contribute to low-oestrogen symptoms: poor sleep, low libido, bone loss, and the fatigue that many women in perimenopause describe. > The gut does not just digest your food. It actively regulates your hormones — and the balance of your microbiome determines which direction that regulation tips. ## The Gut–Cortisol Connection Oestrogen is not the only hormone shaped by gut health. The gut–brain axis — the bidirectional communication network between the gut and the central nervous system — also influences cortisol regulation. Gut bacteria produce short-chain fatty acids (SCFAs) and neurotransmitter precursors, including around 90% of the body's serotonin, which modulates the stress response and the HPA (hypothalamic-pituitary-adrenal) axis. A disrupted microbiome increases intestinal permeability — sometimes called 'leaky gut' — which allows bacterial fragments to enter the bloodstream and trigger low-grade systemic inflammation. This inflammation activates the HPA axis, raising cortisol. Elevated cortisol, in turn, suppresses beneficial gut bacteria and increases intestinal permeability further. It is a cycle that is easy to enter and difficult to exit without deliberate intervention. ## PCOS, Thyroid, and the Microbiome Women with polycystic ovary syndrome (PCOS) consistently show reduced microbial diversity compared to women without the condition, with lower levels of Lactobacillus and Bifidobacterium species. Research published in Frontiers in Endocrinology suggests that gut dysbiosis may worsen insulin resistance — a core driver of PCOS — by impairing short-chain fatty acid production and increasing systemic inflammation. The thyroid is similarly affected. Gut bacteria are involved in the conversion of T4 (inactive thyroid hormone) to T3 (active thyroid hormone). Dysbiosis can impair this conversion, contributing to hypothyroid-like symptoms — fatigue, weight gain, cold intolerance, brain fog — even in women whose TSH levels appear within the normal range on standard blood tests. ## What Disrupts the Gut–Hormone Axis - A low-fibre diet. Gut bacteria ferment dietary fibre to produce SCFAs — the primary fuel for colonocytes and a key regulator of inflammation and hormone metabolism. Without adequate fibre, beneficial bacteria decline rapidly. - Antibiotic use. A single course of broad-spectrum antibiotics can reduce microbial diversity for up to two years. This is not an argument against antibiotics when they are necessary — it is an argument for deliberate microbiome restoration afterwards. - Chronic stress. Elevated cortisol directly suppresses Lactobacillus and Bifidobacterium species and increases intestinal permeability. - Alcohol. Even moderate alcohol consumption alters the ratio of Firmicutes to Bacteroidetes — a shift associated with increased oestrogen recycling and systemic inflammation. - Hormonal contraceptives. The research here is nuanced, but some studies suggest that combined oral contraceptives alter microbial diversity, which may partly explain why some women experience mood changes, digestive symptoms, and libido shifts on the pill. ## What Supports It The good news is that the gut microbiome is highly responsive to dietary change — more so than almost any other system in the body. Meaningful shifts in microbial composition can be detected within 72 hours of a significant dietary change. - Eat 30 different plant foods per week. The landmark American Gut Project found that people who consumed 30 or more distinct plant species weekly had significantly greater microbial diversity than those who ate fewer than 10. Diversity here includes vegetables, fruits, wholegrains, legumes, nuts, seeds, herbs, and spices — each counts as one. - Prioritise fermented foods. Yoghurt, kefir, sauerkraut, kimchi, miso, and kombucha introduce live bacteria and have been shown in randomised controlled trials to increase microbial diversity and reduce inflammatory markers. - Include prebiotic foods daily. Garlic, onions, leeks, asparagus, Jerusalem artichokes, oats, and slightly underripe bananas feed the beneficial bacteria already present in your gut. - Protect your sleep. The gut microbiome follows a circadian rhythm. Disrupted sleep — even a single night — alters microbial composition in ways that affect oestrogen metabolism and cortisol regulation the following day. - Manage stress deliberately. Mindfulness, breathwork, and regular movement all reduce cortisol and have measurable positive effects on gut barrier integrity. ## A Note on Testing Gut microbiome testing has become more accessible, but the interpretation of results remains complex. A test can tell you which species are present and in what relative abundance — it cannot yet reliably tell you what to do about it. The most evidence-based approach remains dietary: increase diversity, reduce ultra-processed foods, add fermented foods, and address the lifestyle factors that drive dysbiosis. ## The Bigger Picture The gut–hormone axis is not a niche concern for women with diagnosed conditions. It is a foundational system that shapes energy, mood, weight regulation, skin health, immune function, and reproductive health across every decade of a woman's life. The women who understand it — and who eat accordingly — have a structural advantage that no supplement can replicate. This is precisely why every Nukrition protocol begins with a full clinical intake that includes digestive history, dietary patterns, and hormonal symptoms together — because the conversation between the gut and the endocrine system is where the most meaningful clinical insights live. --- # Sleep, Cortisol, and the Hidden Cost of Doing Too Much - Canonical URL: https://www.nukrition.com/journal/sleep-cortisol-doing-too-much - Category: Lifestyle - Published: August 2026 - Author: Kriti, Health Coach & Pharmacist > When a full life becomes a permanently activated one, sleep and stress physiology can begin to reinforce each other. Here is how to notice the pattern — and respond without turning recovery into another project. You can be competent, organised, and deeply tired at the same time. Many women I meet are carrying a career, a household, ageing parents, children, relationships, and the invisible work of remembering what everyone else needs. From the outside, life is functioning. At night, the body tells a different story: you are exhausted at 9pm, alert at 11pm, awake again at 3am, and reaching for coffee before the day has properly begun. It is tempting to reduce this to ‘high cortisol’. The reality is more nuanced. Cortisol is not the enemy, and a list of symptoms cannot tell you what your cortisol level is. But chronic stress and insufficient sleep can disturb the daily rhythm that helps you feel awake in the morning and ready for rest at night. Once sleep and stress begin feeding each other, doing more is rarely the answer. ## Cortisol has a rhythm — not a moral value Cortisol is made by the adrenal glands under the direction of the hypothalamic–pituitary–adrenal, or HPA, axis. It helps regulate blood pressure, immune activity, energy availability, and the response to a genuine demand. In a typical circadian pattern, cortisol rises around waking and falls across the day. That morning rise is useful: it is part of how the body prepares to get up and engage with the world. Sleep loss can flatten that orderly decline. Controlled studies have found higher afternoon or evening cortisol after restricted sleep, including in women, although the size and timing of the response varies. This is why ‘my cortisol is high’ is too simple a conclusion. The more helpful question is whether your days and nights are giving your stress system clear, repeated signals about when to mobilise and when to stand down. > Recovery is not the reward for finishing everything. It is one of the conditions that lets the body do its work well. ## The tired-but-wired loop A demanding day can delay the transition from alertness to rest. A short or fragmented night then makes the next day feel harder: concentration slips, appetite cues may become less predictable, and ordinary problems can feel more urgent. Coffee moves earlier and sometimes later. Meals become whatever fits between calls. Exercise is either abandoned or pushed harder in an attempt to regain control. By bedtime, the body is tired but the mind is still working through the list. The early signs are often ordinary enough to dismiss: needing caffeine to feel human, feeling sleepy all afternoon but gaining a second wind at night, waking frequently, becoming less patient, craving quick energy, or finding that a weekend lie-in never quite repairs the week. None of these symptoms proves a cortisol problem. Together, they are a useful invitation to look at sleep opportunity, workload, meal rhythm, alcohol, caffeine, movement, and the pressures you have normalised. ## Why the picture can change after 35 For women in their late thirties, forties, and fifties, sleep can be affected by more than a crowded calendar. During perimenopause, changing hormone levels can contribute to hot flushes, night sweats, mood changes, and difficulty falling or staying asleep. Caring responsibilities and senior roles often peak at the same time. The result is not a failure of resilience; it is several real demands arriving in the same season of life. This is also why generic advice can feel insulting. A woman waking because of night sweats needs a different conversation from one working late across time zones, snoring heavily, under-eating during the day, or drinking wine to switch off. The pattern matters more than the label. ## A quieter two-week reset You do not need a perfect evening routine. Start with a few signals the body can recognise, and repeat them long enough to learn from the result. - Protect a realistic sleep window. Most adults need around seven to nine hours. Work backwards from a consistent wake time and treat the window as an appointment, not spare capacity. - Seek daylight early in the day and dim the evening. Morning light helps anchor the body clock; a quieter, lower-light final hour makes the contrast clear. - Bring caffeine forward. Its effects can last for hours, so try keeping it to the morning and notice whether sleep onset or night waking changes. - Eat regularly enough to avoid arriving at evening depleted. Build meals around protein, fibre-rich plants, and enough food for your actual day rather than trying to be ‘good’ until dinner. - Create a closing ritual. Write tomorrow's priorities down, close the laptop, and choose one low-stimulation activity. The purpose is not optimisation; it is to stop rehearsing the day in bed. - Reduce one demand. Recovery cannot be added indefinitely on top of overcommitment. Postpone, delegate, shorten, or decline one thing that does not need to be yours. - Track patterns, not perfection. For two weeks, note bedtime, waking, caffeine, alcohol, cycle changes, night sweats, and daytime energy. A simple pattern is more useful than a wearable score you do not know how to act on. ## Know when this needs more than lifestyle advice Persistent fatigue and poor sleep deserve proper assessment. Speak with your GP if sleep problems are lasting, affecting daily life, or accompanied by loud snoring or gasping, significant mood changes, palpitations, unexplained weight change, severe night sweats, or other new symptoms. Iron deficiency, thyroid conditions, sleep apnoea, medication effects, depression, anxiety, and menopausal symptoms can overlap with what people casually call ‘cortisol symptoms’. Chronic insomnia also has a specific, evidence-based treatment: cognitive behavioural therapy for insomnia, or CBT-I. Be cautious with at-home cortisol panels and supplements sold as a universal answer. A cortisol result is highly dependent on timing and clinical context. Testing and treatment for an endocrine disorder belong with an appropriately qualified medical professional. ## What a bespoke approach looks like At Nukrition, sleep is never discussed in isolation. We look at your energy across the day, stress load, menstrual or perimenopausal changes, meal timing, caffeine and alcohol, medications and supplements, digestion, movement, medical history, and recent bloodwork where relevant. Then we choose the smallest useful changes and refine them as your body responds. That is the hidden cost of doing too much: it can make you believe your body is another problem to manage. It is not. Often, it is giving accurate feedback about a life with too little margin. The aim is not to become less ambitious. It is to build enough recovery into the way you live that your ambition no longer borrows from tomorrow. ### Sources - [NHLBI: How the body clock regulates cortisol](https://www.nhlbi.nih.gov/health/sleep-deprivation/body-clock) - [Omisade et al.: Acute sleep restriction, cortisol and leptin in women](https://pubmed.ncbi.nlm.nih.gov/20138072/) - [NHLBI: Healthy sleep habits](https://www.nhlbi.nih.gov/health/sleep-deprivation/healthy-sleep-habits) - [Office on Women's Health: Menopause symptoms and sleep](https://womenshealth.gov/menopause/menopause-symptoms-and-relief) - [American College of Physicians: CBT-I as first-line treatment for chronic insomnia](https://www.acponline.org/acp-newsroom/acp-recommends-cognitive-behavioral-therapy-as-initial-treatment-forchronic-insomnia) --- # What Happens in Your First Nukrition Session - Canonical URL: https://www.nukrition.com/journal/what-happens-in-your-first-nukrition-session - Category: The Program - Published: August 2026 - Author: Kriti, Health Coach & Pharmacist > No judgement, no generic meal plan, and no expectation that you arrive perfectly prepared. Here is how your first private session turns a complex health picture into a clear, practical starting point. Booking nutrition support can feel surprisingly exposing. You may have years of symptoms to explain, a drawer of supplements you are no longer sure about, blood results described as ‘normal’, and a quiet fear that you will be told to try harder. A first Nukrition session is designed to feel different: private, unhurried, and interested in the life around your food as much as the food itself. It is not a test, and there is no ideal client performance. You do not need a flawless food diary or a neatly packaged goal. My role is to help organise the information, identify what matters first, and build a plan that is clinically responsible and realistic for the way you actually live. ## Before we talk about food, we talk about you We begin with what brought you here. Perhaps your energy has changed, digestion has become unpredictable, sleep no longer restores you, or perimenopause has made a once-familiar body feel unfamiliar. Perhaps you want support with weight, blood-sugar regulation, or simply eating well without devoting your life to it. We turn that broad concern into goals that are meaningful to you — not numbers chosen on your behalf. Then we build the whole picture. The intake covers medical and family history, current medication, supplements, previous surgery, allergies or food sensitivities, pregnancy status where relevant, and recent bloodwork you choose to share. We also discuss digestion, energy, sleep, mood and stress, menstrual or menopausal patterns, headaches, skin, hair and nails, joint pain, immunity, exercise, occupation, smoking, alcohol, caffeine, hydration, and weight history. > The first session is not about collecting the most data. It is about finding the few connections that make your next step clearer. ## We look at a real week — not an ideal one Food makes more sense in context, so we look at typical weekdays and weekends separately: breakfast, lunch, dinner, snacks, meal times, takeaways, and what happens before bed. We are looking for rhythms and constraints. A rushed breakfast on school-run days, a three-hour commute, late meetings, travel, cultural foods, budget, cooking confidence, and who else eats at home all affect what will work. There is no moral language attached to what you eat. A diet diary is useful only when it is honest. If the plan cannot accommodate restaurant meals, celebrations, a demanding quarter at work, or the nights when you simply cannot cook, it is not bespoke — it is wishful thinking. ## We decide what not to change yet A long intake can reveal many possible improvements. That does not mean you leave with twenty instructions. We agree on the first priorities together, taking account of impact, effort, safety, and your available capacity. Sometimes the first move is a more substantial breakfast. Sometimes it is meal timing, hydration, a GP conversation, a sleep routine, or stopping the expensive cycle of buying supplements without a clear reason. Nutrition coaching complements medical care; it does not diagnose, prescribe, or replace it. If something in your history or symptoms needs investigation, I will encourage you to speak with your GP or relevant clinician. Being clear about that boundary is part of good care. ## What happens after the session Your first conversation becomes a working protocol, not a forgotten set of notes. Inside your private Nukrition portal, your agreed goals, session notes, action items, and selected resources live together. You can record your typical diet, review your programme, securely share relevant documents, and see progress over time. The portal is there to reduce mental load — not create another dashboard you must constantly maintain. Across the twelve-week programme, our 1:1 sessions follow the same disciplined rhythm: assess honestly, design precisely, and refine patiently. We keep what is working, change what is not, and adjust as your health, schedule, and confidence evolve. That continuity is the difference between a personalised protocol and a static meal plan. ## What you leave with - A clearer explanation of the patterns we can reasonably address through nutrition and lifestyle. - A small number of agreed priorities, written in plain language. - Practical actions designed around your calendar, preferences, responsibilities, and budget. - A private place for your goals, guidance, notes, and relevant resources. - A plan for review, including what progress will look like and when medical input may be appropriate. ## What you will not receive You will not receive a detox, an unnecessarily restrictive list, a cupboard full of automatic supplements, or a template with your name placed at the top. You will also not be promised a specific result by a specific date. Bodies are not projects with guaranteed delivery times. Good coaching creates the conditions for progress, measures what is changing, and responds honestly. ## A considered investment, made transparent The Nukrition Program is €450 + VAT for three months of private 1:1 support, payable once or in three equal instalments of €150 + VAT with no instalment surcharge. Spread across the programme, that is less than €5 a day before VAT. The intention is to make bespoke, clinically informed support attainable without diluting the personal work: one practitioner, one client, one evolving protocol. If you are unsure whether that level of support is right for you, begin with the consultation. It is a relaxed, no-obligation conversation about your goals and an honest assessment of whether Nukrition can help. A good first session should leave you feeling understood and clear — never sold to. ## How to prepare — lightly - Bring a list of current medications and supplements, including doses if you know them. - Have recent blood results available if they are relevant and you are comfortable sharing them. - Think about the one change you most want to feel in daily life — more energy, steadier digestion, better sleep, fewer symptoms, or greater confidence around food. - Write down your questions. Nothing is too basic, and you do not need to remember everything in the room. - Do not clean up your diet beforehand. Your ordinary week is the most useful place for us to begin. You have probably spent a long time trying to solve this alone. The first Nukrition session is where that work becomes shared: your lived knowledge of your body, met with clinical curiosity, practical structure, and enough patience to do the next thing properly. --- # Iron, Fatigue, and the Diagnosis That Gets Missed - Canonical URL: https://www.nukrition.com/journal/iron-fatigue-the-diagnosis-that-gets-missed - Category: Hormonal Health - Published: May 2025 - Author: Kriti, Health Coach & Pharmacist > Ferritin is not the same as iron. Many women with 'normal' blood results are still functionally depleted. Here is how to read your own numbers. You have had your bloods done. The GP has called to say everything looks normal. And yet you are exhausted — the kind of tired that sleep does not fix, that coffee only temporarily masks, and that has quietly been getting worse for months or years. If this is familiar, there is a good chance that the result your doctor described as 'normal' included a ferritin level that is anything but optimal. This is one of the most common and most consequential oversights in women's health — and it is almost entirely preventable once you know what to look for. ## Iron vs. Ferritin: The Distinction That Changes Everything Iron is the mineral. Ferritin is the protein that stores it. When your body is running low on iron, it draws from ferritin reserves before serum iron levels drop — which means ferritin falls first, often long before a standard iron panel shows anything abnormal. Most standard blood panels measure serum iron, haemoglobin, and haematocrit. Anaemia — the clinical diagnosis — is only confirmed when haemoglobin falls below a threshold. But functional iron deficiency, where ferritin is depleted and cells are starved of the iron they need to produce energy, can exist for years before anaemia develops. During that time, a woman can experience every symptom of iron deficiency while being told her results are fine. > Ferritin is the early warning system. By the time haemoglobin drops, the body has already been compensating — and suffering — for a long time. ## What the Research Says About Optimal Ferritin Laboratory reference ranges for ferritin vary widely between institutions, but most set the lower limit of 'normal' at 12–15 µg/L. This is the threshold below which frank iron deficiency anaemia becomes likely — it is not the threshold for optimal function. Clinical research, including studies published in the European Journal of Haematology, suggests that symptoms of iron deficiency — fatigue, hair loss, poor concentration, cold intolerance, restless legs, and low mood — can occur at ferritin levels well below 50 µg/L, even when haemoglobin is normal. Some practitioners and researchers use 70–100 µg/L as a functional target for women experiencing these symptoms, particularly those with heavy menstrual bleeding, endurance exercise habits, or a history of restrictive eating. ## Why Women Are Disproportionately Affected Iron deficiency is the most common nutritional deficiency worldwide, and women of reproductive age are its primary demographic. The reasons are structural: - Menstrual blood loss. Each menstrual cycle costs approximately 0.5–1 mg of iron per day across the cycle. Women with heavy periods (menorrhagia) can lose significantly more — sometimes enough to outpace dietary absorption even on a well-constructed diet. - Pregnancy and postpartum. Pregnancy dramatically increases iron demand. Postpartum iron depletion is common and frequently unaddressed, contributing to the fatigue and low mood that many women attribute to the demands of new parenthood. - Lower dietary iron density. Women tend to eat less red meat — one of the most bioavailable sources of haem iron — than men, and plant-based iron (non-haem iron) is absorbed at a fraction of the rate. - Gut absorption issues. Conditions like coeliac disease, low stomach acid (common with long-term PPI use), and gut dysbiosis all impair iron absorption, meaning dietary intake does not reliably translate into adequate stores. - Thyroid dysfunction. Hypothyroidism reduces stomach acid production and slows gut motility, both of which impair iron absorption — creating a cycle where thyroid and iron issues compound each other. ## The Symptoms Nobody Connects to Iron Fatigue is the headline symptom, but low ferritin presents in ways that are rarely attributed to iron in clinical practice: - Hair loss and thinning. Ferritin is required for hair follicle cell division. A ferritin level below 40 µg/L has been associated with telogen effluvium — diffuse hair shedding — in multiple studies. - Restless legs syndrome. Iron is a cofactor in dopamine synthesis. Low ferritin is one of the most consistently identified correctable causes of restless legs, yet it is rarely checked first. - Breathlessness on exertion. Even without anaemia, low ferritin reduces the efficiency of mitochondrial energy production, making physical effort feel disproportionately hard. - Poor concentration and brain fog. Iron is essential for myelin synthesis and neurotransmitter production. Cognitive symptoms are among the earliest and most debilitating manifestations of functional deficiency. - Low mood and anxiety. The link between iron status and mental health is increasingly well-documented. Iron deficiency alters serotonin and dopamine metabolism, contributing to mood instability that is often treated pharmacologically without the underlying deficiency being addressed. ## How to Ask for the Right Test If you are experiencing these symptoms, ask your GP or healthcare provider specifically for a ferritin test — not just a 'full blood count' or 'iron panel'. These are different tests. A full blood count measures haemoglobin and red cell indices; it will not detect functional iron deficiency until it is advanced. Ferritin must be requested explicitly. When you receive your result, note the number — not just whether it is flagged as abnormal. A ferritin of 14 µg/L is technically within the reference range at most laboratories. It is not, for most women, a level at which they will feel well. ## Repletion: Food First, Then Supplementation Dietary iron comes in two forms. Haem iron, found in red meat, poultry, and fish, is absorbed at 15–35% efficiency. Non-haem iron, found in legumes, dark leafy greens, tofu, fortified cereals, and dried fruit, is absorbed at 2–20% depending on what it is eaten with. - Pair non-haem iron sources with vitamin C. Ascorbic acid converts non-haem iron to a more absorbable form. A squeeze of lemon on lentils, or a glass of orange juice with fortified oats, meaningfully increases absorption. - Separate iron-rich meals from calcium and tannins. Calcium (dairy, fortified plant milks) and tannins (tea, coffee, red wine) inhibit iron absorption. Avoid consuming them within an hour of iron-rich meals. - Cook in cast iron. Acidic foods cooked in cast iron cookware absorb measurable quantities of iron from the pan — a practical and underused strategy. - Consider supplementation carefully. If ferritin is significantly depleted, dietary change alone may not be sufficient to restore stores within a clinically meaningful timeframe. Iron bisglycinate is generally better tolerated than ferrous sulphate and causes fewer gastrointestinal side effects. Always supplement under guidance — iron overload, though less common, carries its own risks. ## The Bigger Picture Iron deficiency is not a niche concern or a developing-world problem. It is a widespread, underdiagnosed condition that affects a significant proportion of women in high-income countries — including women who eat well, exercise regularly, and have no obvious risk factors. The gap between 'normal' on a lab report and 'optimal' for health is real, and it matters. If you have been told your bloods are fine but you do not feel fine, ferritin is one of the first places to look. It is a simple, inexpensive test — and for many women, the result changes everything.