Eating for your menstrual cycle: what to eat in each phase

The cycle is not just "your period": 4 phases, 4 needs

The menstrual cycle lasts an average of 28 days (21 to 35 is normal) and divides into four phases, each with a distinct hormonal profile: menstrual, follicular, ovulation and luteal. Those hormones do not only regulate fertility; they also influence how hungry you are, your cravings and how much water you retain. On the energy you burn at rest they have much less influence than is usually claimed. That is why eating exactly the same for all 28 days ignores part of the information your body is giving you.

What the science says: hunger changes more than expenditure

Appetite is the best-documented part. A meta-analysis of 15 datasets with 330 women found higher intake in the luteal phase than in the follicular, with a crude difference of 168 kcal a day (Tucker, Nutr Rev 2025), although the authors note repeated methodological inconsistencies. Expenditure is another story. The figure that circulates most comes from Webb's classic work (Am J Clin Nutr, 1986): 10 women measured by calorimetry burned on average 9% more over 24 hours during the luteal phase. But that is 24-hour expenditure, not resting metabolism, and pooling 26 studies with 318 women the rise in resting metabolism is small and, in studies published since 2000, not significant (Benton, PLoS One 2020). A 2026 study of 21 active women found no difference between phases (Wagner, 2026). Translated: that "I am hungrier before my period" is real for many women, but it does not mean your body burns 10% more.

What to prioritise in each phase (summary)

Menstrual phase (days 1-5): replenish iron

With bleeding you lose iron, which is why women of childbearing age need more than men (about 18 mg/day vs 8 mg). Iron deficiency is one of the most common causes of fatigue in women. Energy is usually low these days, so it is not the time to cut calories: it is the time to eat wisely.

• Heme iron (absorbs better): lean red meat, turkey, mussels, sardines.
• Plant iron: lentils, chickpeas, tofu, spinach, quinoa — ALWAYS combine with vitamin C.
• Vitamin C to absorb iron: peppers, citrus, kiwi, strawberries, tomato.
• Magnesium for cramps and mood: dark chocolate, nuts, seeds, legumes.
• Avoid coffee or tea with iron-rich meals (they reduce its absorption).

Follicular phase (days 6-13): your best window

After your period oestrogen rises and, with it, your insulin sensitivity and your performance. It is the phase in which you tolerate carbohydrates best and usually have the most strength and energy to train. Make the most of it: prioritise protein to build and repair, and complex carbs to perform. If you train strength, this is the fortnight to go for your best numbers.

Ovulation (~day 14): hydrate and add colour

At ovulation oestrogen reaches its peak and body temperature rises by about 0.4 degrees, which slightly increases your water needs. Drink a little more and go for foods rich in antioxidants (berries, deeply coloured vegetables, green tea). It is a short phase but a good moment for fresh, light meals.

Luteal phase (days 15-28): manage the hunger, do not fight it

This is where many diets derail. Progesterone rises and, on average, appetite grows: about 168 kcal a day more than in the follicular phase in a meta-analysis, while resting expenditure barely changes. If you reach the evening ravenous, it is easy to end up bingeing. The strategy is to get ahead of it: more satiating meals with protein and complex carbs, and a planned snack for the time of day when you are usually hungriest.

Premenstrual cravings: why they happen and what to do

The most repeated explanation is that serotonin drops in the late luteal phase and the brain asks for sugar to restore it. It is a hypothesis, not a proven fact: it comes from small studies in women with severe premenstrual syndrome. What has been measured is that, on average, people eat more. It is not a character flaw, and fighting it with pure willpower almost never works. What helps is not arriving ravenous (regular, satiating meals), giving yourself a controlled treat instead of banning it, and keeping options you like and that fill you up to hand.

If you take hormonal contraceptives

Important: the pill, ring, patch or hormonal IUD provide synthetic hormones that flatten the natural fluctuations of the cycle. If you use one of these methods, the per-phase variations in hunger and metabolism practically disappear, so it makes no sense to "cycle" your eating. Eat for your goal steadily all month.

How to apply it without obsessing

You do not need four different diets or a complicated calendar. Keep three ideas: on your period mind your iron, in the follicular phase make the most of it to train and eat well, and in the luteal phase anticipate the hunger with satiating food instead of resisting. The rest is the usual — enough protein, real food and consistency. The difference is that you now stop blaming yourself for being hungrier some days: it is simply your body doing its job.