A Woman's Nutritional Guide: From Periods to Menopause

A woman's body is rhythmic. Hormonal. Changing constantly. And almost every nutrition guide in existence has been built for bodies that don't menstruate.

Your body is not a man's body

The Recommended Dietary Allowance for iron is 8 mg/day for adult men and 18 mg/day for premenopausal women, reflecting menstrual blood losses.¹

But that's just the beginning of where women's nutrition diverges from the textbook. Oestrogen affects how you absorb nutrients. It changes how you metabolise glucose. It influences your need for magnesium, for B6, for folate. It changes what happens to your mood, your energy, your recovery when those nutrients are missing.

And then there's the shift at perimenopause. Oestrogen doesn't disappear smoothly. It fluctuates wildly, which means nutrient needs flux too. Iron needs stay high even after you stop menstruating because oestrogen's drop creates other problems: bone loss, cardiovascular strain, metabolic shifts that only whole food nutrition can address.

You are not a smaller man with breasts. You have a cyclical metabolism, specific nutrient losses, and hormonal drives that require a completely different nutritional architecture.

Iron: the element you're probably missing

Iron deficiency in women is widespread and often invisible. You might not feel dramatically anaemic. You might just feel perpetually tired, brain fog, struggling with mood, your hair thinning, your nails brittle, struggling on stairs, cold all the time. All of those can be iron. And most of the time, nobody tests for it properly because they only look at haemoglobin, which is the last marker to drop.

The issue is threefold. First, you're losing it monthly through menstrual blood. An average period bleeds roughly 30-40ml of blood, which contains 15-20mg of iron. That's nearly your entire monthly iron intake gone in a few days. Second, plant-based iron is poorly absorbed compared to animal iron. A handful of spinach does not replace a portion of liver. The body converts between 3 and 6 per cent of plant iron into usable form, whereas animal iron (heme iron) is absorbed at around 15 to 35 per cent. That gap matters if you're trying to build reserves. Third, your gut health affects iron absorption. If your stomach acid is low or your gut is inflamed, even good iron sources won't be absorbed well.

Ferritin, the storage form of iron, should ideally sit above 70 ng/mL for optimal energy, mood, and hair health. If your ferritin is in the 20-30 range, you'll likely feel it. Below 12, you're clinically anaemic. But here's the thing: subclinical deficiency, where your haemoglobin looks okay but your ferritin is low, is the most common state for women and it's the state that steals your energy first. You won't fail a traditional blood test. You'll just live in a fog.

The richest dietary sources of iron include organ meats, red meat, oysters, clams, and poultry. Heme iron from animal sources is absorbed at roughly 14–18% from a mixed diet, compared with 5–12% from a vegetarian diet, and ascorbic acid (vitamin C) enhances non-heme iron absorption.¹

The strategy is simple: hunt iron deliberately. Aim for organ meats (liver, kidney, heart) at least weekly. Red meat at least twice weekly. Shellfish monthly. This isn't optional supplementation. This is primary nutrition.

If you want to feel genuinely energised, iron should be a food you hunt deliberately, not hope appears accidentally in your diet. Organ meats, red meat, fish: these are the reliable sources.

The B vitamins that run your cycle

Oestrogen affects B vitamin metabolism directly and profoundly. Higher oestrogen phases of your cycle (the follicular phase, roughly day 1-14) increase the breakdown of B vitamins, particularly B6 and folate. Your luteal phase (roughly day 15-28) is when progesterone rises and B vitamin needs intensify. B6 is essential for serotonin production, which is why mood often dips in the luteal phase when B6 is low. This isn't mood weakness or PMS hysteria. It's a biochemical reality. Folate is involved in methylation, the biochemical process that keeps your nervous system calm and your mood stable. It's also essential for managing homocysteine, an inflammatory marker that rises when folate is low.

Vitamin B12 occurs naturally only in animal-source foods, with liver, clams, fish, red meat, eggs and dairy as the main sources. People who avoid animal foods are at substantially higher risk of B12 deficiency.²

Choline is an essential nutrient required for synthesis of phosphatidylcholine and acetylcholine, with eggs and beef liver among the densest dietary sources. The Adequate Intake is 425 mg/day for non-pregnant women, rising during pregnancy and lactation.³

The pattern is consistent: animal foods dramatically outperform plant alternatives for B vitamin density and bioavailability. If you want to support your cycle, prioritise liver and eggs across the entire month, then slightly increase B-rich foods in your luteal phase (roughly day 15-28) to offset the increased metabolic demand. Two to three eggs daily, liver weekly, and red meat at least twice weekly creates a robust B vitamin foundation.

Fat-soluble vitamins and hormonal health

Vitamins A, D, E, and K live in fat, and they require dietary fat to be absorbed. This is why low-fat diets are particularly damaging for women: you cannot optimise hormonal health on a low-fat diet. You simply cannot. Oestrogen production depends on dietary fat. Progesterone signalling depends on it. Vitamin D absorption depends on it. These are not negotiable.

Vitamin A supports the health of the uterine lining and the production of cervical mucus (the clear, stretchy mucus during fertile days). Deficiency correlates with heavier, more painful periods and difficulty conceiving. The richest source is liver (retinol, the active form): 100g of beef liver contains 6000+ IU of vitamin A. Grass-fed dairy and pastured eggs contain significant amounts. Orange vegetables contain beta-carotene, which converts to vitamin A poorly (the conversion rate is roughly 12:1 by weight, and it requires dietary fat for absorption anyway). A woman trying to get vitamin A primarily from carrots is fighting uphill.

Vitamin D is involved in oestrogen and progesterone production, immune function, and bone health. Most women are deficient, particularly if they live north of 40 degrees latitude or work indoors. If you're not supplementing or getting regular midday sun exposure in summer (which most of us aren't), you're probably low on your own. Egg yolks contain about 40-60 IU per yolk. Wild salmon contains 400-1000 IU per 100g. Grass-fed butter contains some. Supplementation is often necessary in northern climates, particularly October through March. Consider 2000-4000 IU daily, ideally checked with blood work.

Vitamin K2, the activated form, is critical for bone and cardiovascular health and is chronically overlooked. It's found in fermented foods (sauerkraut, natto, aged miso), grass-fed butter, aged cheeses (particularly Gouda and Gruyère), and organ meats. A serving of natto (fermented soya beans) contains roughly 200 mcg of K2. As oestrogen declines at perimenopause, K2 becomes even more important for maintaining bone density and preventing arterial calcification.

The practical approach: eat butter and whole fat dairy, eat liver and red meat, eat egg yolks, and don't fear dietary fat. It's not the enemy of your hormones. It's the foundation.

Eating fat is not the problem. The fats you're eating,or not eating,are shaping your hormonal health in ways restrictive dieting never captures.

Cycle syncing basics

Your metabolic needs are not constant across your cycle. Your follicular phase (roughly day 1-14) is higher in oestrogen. Your luteal phase (roughly day 15-28) is higher in progesterone. These hormones shift your nutrient needs, your hunger, your energy expenditure.

In the follicular phase, oestrogen is rising. Your metabolic rate is lower, your appetite is lower, your energy is more stable. This is when lighter meals, more movement, and more complex carbohydrates work well. Your body is processing nutrients efficiently.

In the luteal phase, progesterone is rising. Your metabolic rate increases. Your appetite genuinely increases (this is not weakness, it's biology). You need more calories, more magnesium, more B6, more complex carbohydrates to stabilise blood sugar. Skipping food or restricting heavily in the luteal phase is fighting your biology, not honouring it.

This isn't about eating different foods. It's about eating the same foods in different quantities and timing. More meals in the luteal phase. More magnesium-rich foods (pumpkin seeds, dark chocolate, leafy greens). More complex carbs. More balanced protein at each meal.

Perimenopause and menopause: reframe what nutrition looks like

Perimenopause typically begins in your 40s. Oestrogen doesn't decline smoothly; it fluctuates chaotically. This is when most women experience the worst symptoms: mood swings, night sweats, irregular periods, brain fog, weight gain. Nutrition cannot prevent menopause, but it can make the transition dramatically more manageable.

Iron remains essential even after you stop menstruating. Oestrogen's decline increases your cardiovascular risk and your bone loss risk. Iron is critical for both. Keep hunting liver and red meat deliberately.

Calcium and K2 become central. Your bone loss accelerates at menopause. Calcium from whole food (raw dairy if you can source it, leafy greens, bone broth, eggs) combined with K2 and vitamin D creates the conditions for maintaining bone density. Supplemental calcium without K2 and D is largely wasted.

Magnesium is perhaps more important in menopause than at any other life stage. It supports sleep quality, mood stability, bone health, and cardiovascular function. Most menopausal women are chronically deficient. Pumpkin seeds, dark chocolate, leafy greens, and magnesium baths become your friends.

Phytoestrogens (plant compounds that mimic oestrogen weakly) appear in soya, flax seeds, and sesame seeds. They do not replace oestrogen, but they may ease some symptoms. More importantly, whole food nutrition that stabilises blood sugar and supports liver function (which processes hormones) is the real foundation.

The bottom line

You need iron more than men do. You need B vitamins in rhythm with your cycle. You need fat-soluble vitamins, and that requires eating fat. At perimenopause and beyond, bone health and cardiovascular health become the urgent priorities, and nutrition is the primary lever.

This is not complicated. Eat liver and red meat, eggs and dairy, leafy greens and root vegetables, whole food fats like butter and olive oil. Eat more in your luteal phase. Eat consistently through perimenopause and menopause. Your body changes across your lifespan. Your nutrition should change with it.

References

1. 1. National Institutes of Health, Office of Dietary Supplements. Iron — Health Professional Fact Sheet. https://ods.od.nih.gov/factsheets/Iron-HealthProfessional/
2. 2. National Institutes of Health, Office of Dietary Supplements. Vitamin B12 — Health Professional Fact Sheet. https://ods.od.nih.gov/factsheets/VitaminB12-HealthProfessional/
3. 3. National Institutes of Health, Office of Dietary Supplements. Choline — Health Professional Fact Sheet. https://ods.od.nih.gov/factsheets/Choline-HealthProfessional/