You eat more before your period because rising progesterone and falling estrogen directly increase your appetite in the week or two leading up to menstruation. This isn’t a lack of willpower. Your body’s metabolism actually speeds up during this phase, burning roughly 100 to 200 extra calories per day, and your brain chemistry shifts in ways that drive specific cravings for carbohydrates and sweets. Here’s what’s happening and what you can do about it.
Progesterone Drives Your Hunger Up
Your menstrual cycle has two main halves. The first half, called the follicular phase, runs from the start of your period to ovulation. Estrogen is the dominant hormone here, and it tends to suppress appetite. Many people notice they feel less hungry and more in control of their eating during this stretch.
After ovulation, you enter the luteal phase, and progesterone takes the lead. Food intake tracks closely with rising progesterone levels, and researchers now think progesterone plays a bigger role in regulating appetite across the cycle than estrogen does. Both hormones act on the appetite center of your brain, where they interact with hunger signals like ghrelin (the hormone that makes you feel hungry) and satiety signals like the one that tells you you’re full after a meal. When progesterone is high and estrogen is dropping, those hunger signals get amplified.
This hormonal shift is the core reason you feel hungrier. It’s a predictable, biological pattern, not something you’re imagining.
Why You Crave Carbs and Chocolate
The cravings for sweets, bread, pasta, and especially chocolate aren’t random. When estrogen drops in the luteal phase, serotonin activity in your brain decreases too. Serotonin is the neurotransmitter most associated with stable mood, calm, and satisfaction. Your brain essentially looks for ways to boost serotonin back up, and one of the fastest routes is eating simple carbohydrates. High-glycemic carbs (think sugary snacks, white bread, pastries) trigger a chain reaction that increases serotonin production in the brain.
This is why reaching for chocolate or candy before your period can feel almost involuntary. Eating those foods genuinely does improve mood for a short time by raising serotonin levels. It’s an unconscious attempt at self-medication. The relief is real, which is why the craving can feel so powerful.
Chocolate cravings specifically may also have a mineral component. Magnesium levels tend to be lower in people who experience premenstrual symptoms, and chocolate is a relatively rich source of magnesium. Whether the craving is driven more by the magnesium content or the sugar and fat is still debated, but the pattern is consistent enough that researchers have documented it across multiple studies.
Your Metabolism Actually Increases
Your body isn’t just craving more food for psychological reasons. Your basal metabolic rate, the number of calories you burn at rest, rises during the luteal phase. Researchers estimate this increase at roughly 8%, which works out to about 164 extra calories per day. That’s not a huge number, but it’s enough to make you noticeably hungrier, especially over the course of a full week.
Your insulin sensitivity also drops during the luteal phase. Insulin is the hormone that moves sugar from your blood into your cells for energy. When your cells become less responsive to insulin, blood sugar levels can spike higher after meals and crash faster afterward. Those crashes trigger hunger signals, which is one reason you might feel hungry again soon after eating or find that meals don’t satisfy you the way they do earlier in your cycle. This effect is well-documented in women with type 1 diabetes, but it happens to some degree in everyone.
The Scale May Move, But Not How You Think
If you weigh yourself before your period and see a jump, most of that is water. Progesterone causes your body to retain fluid, and the typical premenstrual weight fluctuation is 2 to 5 pounds. Craving saltier foods compounds this, since sodium holds onto water. Some of the gain may come from increased calorie intake, but the majority is temporary fluid retention that resolves once your period starts.
If you consistently gain more than 5 pounds before your period, that’s worth exploring with a healthcare provider, as it could point to something else going on.
When Increased Appetite Becomes a Concern
For most people, eating more before a period is normal and manageable. But for some, it crosses into territory that feels out of control. Premenstrual dysphoric disorder (PMDD) is a more severe form of PMS that affects mood, energy, and eating. “Marked change in appetite, overeating, or specific food cravings” is one of the diagnostic criteria for PMDD. If your premenstrual eating feels compulsive, causes significant distress, or looks like binge eating that only happens in the luteal phase, PMDD may be a factor.
PMDD is distinguished from regular PMS by intensity. The symptoms are severe enough to interfere with work, relationships, or daily functioning. If this sounds familiar, it’s a recognized medical condition with effective treatments, not something you need to push through.
What Actually Helps
You can’t override the hormonal shifts, but you can work with them instead of against them. The most practical approach is to acknowledge that your body genuinely needs a bit more fuel during this phase and focus on what kind of fuel you give it.
Since your body is hunting for carbohydrates to boost serotonin, choosing complex carbs over simple sugars can satisfy that drive without the blood sugar roller coaster. Whole grains, oats, sweet potatoes, and legumes all promote serotonin production, but they release sugar more slowly, keeping you fuller for longer and avoiding the crash-and-craving cycle that simple sugars create. Pairing carbs with protein (like toast with eggs or yogurt with fruit and granola) slows digestion further and improves satiety.
Eating more frequently in smaller amounts can also help stabilize blood sugar during a phase when your insulin sensitivity is already lower. Going long stretches without food is more likely to lead to a crash and a compensatory binge than it would during the first half of your cycle.
If chocolate cravings are strong, dark chocolate with a higher cocoa content delivers more magnesium per serving and less sugar. Some people find that a magnesium supplement in the luteal phase reduces cravings and other PMS symptoms, though the evidence is stronger for symptom relief than for craving reduction specifically.
The most important thing to understand is that this hunger is hormonally driven and metabolically real. Your body burns more energy, your brain chemistry changes, and your appetite signals shift. An extra 100 to 200 calories a day during the luteal phase is your body asking for what it needs, not a failure of discipline.