Eat with your cycle,
not against it.

If you menstruate, you live inside a 28-32 day hormonal rhythm. That rhythm has four distinct phases, each with different metabolic needs, different optimal foods, different ideal training intensities, and different cognitive strengths.

Almost no woman is taught any of this. We are taught instead to ignore the cycle entirely — to eat the same way every day, train the same way every day, push the same way every day, and to treat the predictable mid-cycle fatigue and pre-menstrual crash as character flaws to be powered through.

This is, biologically, absurd. And the cost of ignoring the rhythm is enormous: chronic underperformance, recurring fatigue, hormonal dysregulation, and the slow erosion of energy reserves that compounds across decades.

Cycle-aware eating is not difficult. It requires knowing your cycle, paying attention to the phase you're in, and making small adjustments to your food, training, and intensity. The shifts are subtle. The results, after two or three cycles, are dramatic.

The four phases.

Day 1 of your cycle is the first day of your period. From there:

Phase 1 · Menstrual (days 1-5)

Hormones at their lowest. Energy at its lowest. The body is shedding and resetting. Iron is being lost. Inflammation is naturally higher.

What the body wants: warm, mineral-rich, easy-to-digest foods. Bone broth. Dark leafy greens. Root vegetables. Iron-rich foods (red meat, lentils, pumpkin seeds). Magnesium-rich foods. Plenty of water.

Training: gentle. Walking, restorative yoga, light stretching. Not the week for personal bests.

Cognition: reflective. Good for journalling, planning, reviewing — not for big new starts.

Phase 2 · Follicular (days 6-14)

Oestrogen rising. Energy rising. The body is preparing for ovulation. Insulin sensitivity is at its highest — meaning carbohydrates are tolerated well.

What the body wants: light, fresh, vibrant foods. Sprouts and microgreens. Fermented vegetables (kimchi, sauerkraut). Lean protein. Citrus. Smoothies. The body can handle and benefit from a higher proportion of plant foods this week.

Training: build phase. Strength training. New movements. Cardiovascular work. The phase for trying something new at the gym.

Cognition: peak. Best phase for hard creative work, strategic thinking, learning new things, hard conversations you've been postponing.

Phase 3 · Ovulatory (days 14-18)

Oestrogen peaks then drops; LH spikes; ovulation occurs. Energy peak. Communication peak. Confidence peak.

What the body wants: cooling foods. Lots of fibrous vegetables to support oestrogen metabolism. Cruciferous vegetables (broccoli, cauliflower, kale) actively help the body process oestrogen. Light proteins (fish, eggs, plant proteins). Moderate fats.

Training: highest intensity. Best phase for personal bests, HIIT, hardest classes.

Cognition: social peak. Best phase for presentations, networking, sales, performance, the work that requires being switched on.

Phase 4 · Luteal (days 19-28)

Progesterone rises then falls. Energy gradually drops, especially in the last 4-5 days. Cravings intensify. Sleep can disrupt. Mood shifts (sometimes considerably).

What the body wants: warming, grounding, satiating foods. Sweet potato. Butternut squash. Brown rice. Complex carbohydrates. Magnesium-rich foods (dark chocolate, pumpkin seeds, leafy greens). More food generally — the body burns up to 300 extra calories per day in this phase.

Training: moderate, dropping. First half of luteal can sustain strength; second half should drop intensity. The week before period is for walking and gentle yoga, not for personal bests.

Cognition: detail-oriented. Good for editing, refining, finishing — not for big new starts. Be careful of decisions made in the last 3-5 days of the cycle; they tend to be more emotional than they appear.

What changes for perimenopausal women.

As the cycle becomes irregular through perimenopause, the four-phase framework can still apply — but with adaptations. We can use moon phases as a proxy rhythm (new moon = phase 1, waxing = phase 2, full moon = phase 3, waning = phase 4), which sounds quasi-mystical but maps surprisingly well to many women's residual hormonal patterns.

For women in late perimenopause and post-menopause, the four-phase rhythm dissolves but the underlying principle remains: you do not need to eat or train the same way every day for the next forty years. Listening to the body's signals, adjusting accordingly, is itself the medicine.

What changes about fasting.

Intermittent fasting has been popularised in a way that works brilliantly for men and badly for cycling women. The standard schedules — 16:8 every day — were studied largely in male populations and silently wreck female hormones over time.

For cycling women, fasting should be cycle-aware:

• Phase 1 (menstrual): don't fast. The body is already losing nutrients; restricting eating windows compounds the depletion.
• Phase 2 (follicular): longer fasts (15-17 hours) are well-tolerated. This is the best phase for fasting.
• Phase 3 (ovulatory): moderate fasts (13-15 hours).
• Phase 4 (luteal): shorter fasts (12-13 hours). In the last 4-5 days, don't fast at all.

This is the framework Mindy Pelz popularised in Fast Like a Girl, and it adapts beautifully to South African women's lives and food culture. The 90-minute Fast Like a Girl intensive walks through the personalised version for your specific cycle.

One practical move you can make this week.

Start tracking your cycle. Day 1 of your period is the first day. Apps like Clue or Natural Cycles do this beautifully. Within one tracked cycle, your phases become visible. Within three tracked cycles, your patterns become predictable enough that you can begin to plan your week and your eating around them.

This is foundational work for the rest of your life. It costs nothing and changes everything.

Frequently asked.