If you’ve spent any time on TikTok recently, you’ve probably come across cycle syncing. This is the idea that you should eat, exercise and live differently depending on where you are in your menstrual cycle. The hashtag has racked up hundreds of millions of views and the content ranges from genuinely useful to completely made up.
The core idea isn’t wrong. Your hormones do shift significantly across your cycle and those shifts do affect your energy, your mood, your appetite and what your body needs nutritionally. The evidence is real. What’s less reliable is a lot of the specific advice floating around on social media. This is an evidence-led version of this conversation that you can rely on and trust.
The follicular phase begins on the first day of your period and runs until ovulation. In the first few days, hormone levels are low - this is your period itself. But from around day 5 or 6, oestrogen starts to rise as a follicle in the ovary develops. By the end of this phase, oestrogen is at or near its peak and most women notice a lift in energy, mood and mental clarity.
Your period has just ended, which means you’ve lost blood which means you have also lost iron. Replenishing iron is a genuine priority in this phase - especially if your periods are heavy. Good food sources include lentils, tofu, pumpkin seeds and dark leafy greens. Pairing iron-rich foods with vitamin C improves absorption.
B vitamins - particularly B6, B12 and folate - support energy metabolism and the nervous system. Zinc supports immune function, skin health and is involved in the early stages of follicle development. Eggs, pumpkin seeds and legumes are good sources of both.
Energy levels are typically higher in this phase, which makes it a natural window for more demanding exercise and activity if that appeals to you. Continue learning about nutrition for PMS.
Ovulation is a single event - the release of an egg - but it’s preceded by a short window (a few days) where oestrogen is at its peak. For many women this is the point in the cycle where they feel most energetic, most social and most physically capable. Testosterone also briefly rises around ovulation, which contributes to drive and confidence.
This phase is brief, but antioxidants are particularly relevant around ovulation to support the process itself. Colourful vegetables and fruits, berries and foods rich in vitamin E (nuts, seeds, olive oil) are worth emphasising here.
Cruciferous vegetables - broccoli, kale, cauliflower, Brussels sprouts - contain a compound called DIM (diindolylmethane) that supports healthy oestrogen metabolism. Getting oestrogen processed and cleared efficiently in this phase helps set up a better hormonal environment for the luteal phase that follows.
Fibre is also important here. Soluble fibre helps the gut excrete used oestrogen, preventing it from being reabsorbed into circulation. This matters for hormone balance across the whole cycle. You may be interested in reading 'Do I need to take a fibre supplement?'
After ovulation, progesterone rises. Progesterone has a warming, slightly sedating effect, which is why some women notice that they feel warmer and more tired in the second half of their cycle. It also increases your metabolic rate slightly, which means your body is actually burning a few more calories at rest. This is one reason why appetite increases - your body is working harder.
The craving for carbohydrates and sugar in this phase isn’t a lack of willpower. It’s your body responding to increased energy demands and a drop in serotonin (your mood-regulating brain chemical) that comes with falling oestrogen in the late luteal phase. Serotonin is made from tryptophan and carbohydrates help tryptophan cross into the brain. The carb cravings are, in a sense, your brain trying to self-medicate.
Blood sugar becomes harder to regulate in the late luteal phase, which means you’re more likely to experience energy crashes, irritability and strong cravings. The standard advice to ‘just eat less sugar’ is not particularly helpful here. What actually works is managing blood sugar through meal structure rather than restriction.
Magnesium is the standout nutrient for the luteal phase. It’s involved in over 300 processes in the body, supports the nervous system, helps with sleep and has good evidence behind it for PMS symptom relief. Many women are subtly deficient and progesterone’s decline can further deplete it. Food sources include dark chocolate, nuts, seeds and leafy greens - and supplementation is often worthwhile. Continue learning about why women need magnesium.
Vitamin B6 supports serotonin and GABA production — both of which take a hit in the late luteal phase. It’s also involved in progesterone metabolism. Chickpeas and bananas are useful food sources.
Protein at every meal slows glucose absorption and helps stabilise blood sugar. Aim for a palm-sized portion at breakfast, lunch and dinner. Complex carbohydrates (oats, sweet potato, brown rice) rather than refined ones provide energy without the spike and crash.
Caffeine can worsen anxiety, disrupt sleep and increase cortisol — all of which are already under pressure in the late luteal phase. If you’re a coffee drinker, switching to one coffee in the morning and herbal tea after midday can make a noticeable difference. Discover the best alternatives to caffeine.
Alcohol disrupts GABA signalling (your brain’s natural calm mechanism), impairs sleep quality and is a histamine trigger. Even one or two drinks in the premenstrual window can meaningfully worsen anxiety and sleep for sensitive women.
Refined sugar causes blood sugar spikes and crashes that amplify cravings and mood instability. This doesn’t mean zero sugar, it means opting for dark chocolate over a sugary biscuit and being careful with hidden sugars.
The menstrual phase is day 1 to roughly day 5 - your period. Hormone levels are at their lowest and for many women this phase comes with fatigue, cramping and low mood. Some of this is hormonal; some of it is physiological - you’re losing blood and with it, iron.
Iron deficiency is very common in women of reproductive age and it’s frequently missed because testing only happens when anaemia is already present. Low iron (even before full anaemia) causes fatigue, poor concentration, low mood and reduced exercise tolerance. If your periods are heavy, getting your ferritin (stored iron) checked is worth doing. Continue reading about why iron is so important for women.
Prostaglandins are hormone-like compounds that trigger uterine contractions during your period. They are the main driver of cramping. Omega 3 fatty acids, found in oily fish, flaxseeds and walnuts, have anti-inflammatory properties that may help modulate prostaglandin activity. Ginger has a reasonable evidence base for period pain too.
Turmeric, berries, leafy greens and olive oil are all anti-inflammatory staples worth emphasising during your period.
The luteal phase is not the time to push hard at the gym, eat less, or run on caffeine and willpower. Rest is a legitimate nutritional and physical need at this point. If you’re someone who tends to override your body’s signals and then crashes, this phase is where the cost of that shows up.
Iron-rich foods, B vitamins, zinc, protein. Energy is building - this is your window for more demanding activity.
Cruciferous vegetables, colourful produce, fibre and antioxidant-rich foods. Prioritise oestrogen clearance.
Magnesium, B6, complex carbohydrates, protein at every meal. Reduce caffeine, alcohol and refined sugar. Prioritise sleep.
Iron, omega 3s, anti-inflammatory foods. Gentle movement. Honour the need to slow down.
Consider supplementation to help you through these phases.
You may also enjoy reading:
Your shopping basket is empty. Need some help?
Our Virtual Nutritionist is here to assist you.
Subtotal
£0.00
Shipping and taxes calculated at checkout.
