What belongs to the cycle
After ovulation, the luteal phase begins, the second half of the cycle. Besides tension, bloating and mood swings, the symptoms many people know from it explicitly include changes in appetite and cravings. This is documented and common. You're not imagining it.
And it can be put in numbers. A meta-analysis of 15 data sets with 330 participants found an energy intake that was on average 168 kilocalories per day higher in the second half of the cycle than in the first. That's roughly a slice of wholegrain bread with butter. The hunger is real and measurable. It isn't imagination and it isn't weak willpower.
A reason that's often overlooked
Before the cycle becomes the explanation, look at the day before. Evening cravings can also be the bill for eating too little in the morning and at lunch: a skipped breakfast, a lunch from the vending machine, then training. As far as we know, nobody has studied how often that's the real reason in connection with the cycle. We mention it anyway because you can easily check it for yourself.
In the week before your period, both come together: an appetite that's already changed and eating that was already too sparse. What feels like a cycle problem is to a good extent a supply problem.
And hunger around ovulation?
People search for this a lot, and the evidence is thinner here than many posts suggest. Around ovulation, some report more appetite, others less. There is no clear pattern that applies to everyone.
What helps to put it in context: ovulation doesn't reliably happen mid-cycle. An analysis of more than 30,000 cycles from a tracking app showed considerable variation in timing. If you link your appetite to an estimated ovulation day, you may be linking it to the wrong day.
Why it's different during your period
Premenstrual symptoms usually start one to two weeks before the period and ease off shortly after bleeding begins. That applies to cravings too, which for many fade fairly suddenly in the first days of bleeding. What often remains instead is exhaustion. It's easily mistaken for hunger, because both feel like needing energy.
If you're regularly tired and low on energy during these days, food isn't necessarily the answer. It's worth checking your iron status, because iron is lost with every bleed. How to check it sensibly is in Iron, periods and exercise.
What actually helps
- Eat enough during the day. The most effective measure against evening cravings happens in the morning. If you barely eat anything until 4 pm, you won't be negotiating with reason in the evening.
- Protein with every main meal. For people who strength train, recommendations are well above the general reference values for adults, and meals with protein keep you full noticeably longer.
- Don't compensate. The day after a big evening is the worst possible time to cut calories. That's how you build the next craving.
- Take sleep seriously. In studies that deliberately cut sleep to five and a half hours or less, participants ate around 200 kilocalories more per day on average. That's more than the difference between the two halves of the cycle.
- Plan for the craving instead of fighting it. Something sweet after dinner, consciously and in a normal amount, costs less than the fight against it and what follows.
Why the scales add nothing now
Around the same time, the scales show more for some people without any change in body fat. It's water, and measuring studies find half a kilo at most on average. If you read that number as a verdict on your evening, you intensify exactly the cycle of restriction and cravings. There's more in our article on water retention.
Common questions
How long do cravings before your period last? Symptoms of the second half of the cycle usually start one to two weeks before the period and ease off shortly after bleeding begins. If the cravings regularly come at completely different times, looking at food, sleep and training tells you more than looking at the cycle.
Are they stronger if you have PMS? A 2025 study of 150 women points that way. Women with premenstrual syndrome had a clearly stronger appetite for food in the second half of the cycle, even without hunger, and reported around 2,200 instead of 1,880 kilocalories a day on average. The figures come from questionnaires; what they ate wasn't measured.
Why sweet things of all things? Many people say so, but we can't back it up. The meta-analysis behind the 168 kilocalories looked at how much energy was eaten, not which foods it came from. The research we rely on doesn't allow a reliable statement about what the cravings are directed at.
Can cravings be a sign of pregnancy? Yes, they can. The UK's National Health Service (NHS) lists cravings for new foods or losing interest in usual ones among the early signs. They usually start around four to six weeks into the pregnancy, and sore breasts can also feel the way they do before a period. So you can't tell the difference by how it feels. Most pregnancy tests are reliable from the first day of a missed period.
What Rhythmus does with this
The app doesn't charge you penalty calories and doesn't cut anything after a big evening. It doesn't set its own nutrition rule for the second half of the cycle, because none is supported by evidence; it only mentions the slightly higher resting metabolic rate there, as a small and uncertain effect. What a calculated calorie number can actually do is explained in this article.