Cycle syncing has a devoted following and a fair few eye-rollers, so let's find the sensible middle.

The strong version of cycle syncing comes with strict rules: eat these specific foods in your follicular phase, only do gentle yoga in your luteal phase, schedule big meetings around ovulation, and so on. Much of that detail is more confident than the evidence supports. There aren't robust studies proving that, say, eating particular foods on particular cycle days optimises your hormones.

But here's the useful kernel, which is just good cycle awareness:

• Energy really does shift across the month. Many women feel stronger and more outgoing in the first half (rising oestrogen) and flatter or more inward in the late luteal days before a period. That's real biology.
• So working with that, loosely, makes sense. If you naturally have more in the tank mid-cycle, that's a fine time for harder workouts or demanding tasks. If you predictably crash before your period, planning a lighter, kinder few days isn't woo, it's self-awareness.
• It can reduce self-blame. Realising your motivation dip is hormonal, not a character flaw, is freeing.

Where it tips into unhelpful:

• When the rules become rigid enough to cause stress or guilt ("I worked out on the wrong day").
• When it's used to sell apps, supplements, or programmes promising transformation.
• For anyone whose cycle is irregular, absent, or who's in perimenopause, where the neat four-phase template doesn't apply cleanly.

The takeaway: skip the strict rulebook, keep the awareness. Track roughly where you are, notice your own patterns over a few months, and adjust gently when it helps. That's cycle syncing's good idea, minus the hype and the subscription.

Quick answers

Is cycle syncing backed by science?

The broad idea that energy shifts across the cycle is real, but strict rules about exact foods or workouts per phase aren't well supported. Use the awareness, skip the rigid rules.

Does cycle syncing work in perimenopause?

Not neatly — cycles become irregular, so the four-phase template doesn't apply cleanly. General self-awareness still helps.

Related reading: Your cycle, phase by phase · Eating for your hormones · Take the free Hormone Quiz