Your Menstrual Cycle and Appetite: 240 Extra Calories Isn't Weakness — It's Physiology

If you blame yourself for a "collapse in discipline" one week each month — stop. The number is documented, and the cause is physiological.

What does the review say?

A summary of 19 studies showed a significant increase in energy intake of about 10% (roughly 240 kcal) on average in the luteal phase compared with the follicular phase in healthy women of reproductive age^[1].

Increases in appetite and food cravings in the late luteal versus mid-follicular subphase reached 15% and 24% in women of reproductive age, rising sharply in those with premenstrual dysphoric disorder^[2].

And crucially: your body burns more too

This increase appears physiologically adaptive, because resting metabolic rate rises significantly in the luteal phase compared with the follicular^[1]. In one study, the luteal phase showed a significant rise in average core body temperature and energy expenditure of 6.9%^[3].

The literature describes this as a natural process for maintaining energy balance^[1] — not a collapse of willpower.

And honestly: the evidence isn't uniform

Newer research gives a more nuanced picture: although resting metabolic rate tended to rise in the luteal phase, comprehensive appetite and intake assessments showed no significant phase differences in a study of 18 participants^[4]. The effect varies between women.

What to do practically

1. Don't judge yourself weekly — judge monthly. The monthly average is more honest than any single week.
2. Anticipate the week and prepare: higher protein and satiating options ready (the satiety index).
3. Water retention confuses the scale — compare the same week of the previous month (how to weigh).
4. Don't compensate with harsh restriction afterwards — the deprivation-and-rebound cycle is worse than the increase itself (emotional eating).
5. And movement helps: it improves premenstrual symptoms generally (the psychological effect of exercise).