Hormonal shifts in the days before and during menstruation alter metabolism, brain chemistry, and even taste perception in ways that steer the body toward sweet, energy-dense foods. The craving is real and measurable: research consistently finds that appetite, calorie intake, and the specific desire for sweets and chocolate all peak during the late luteal phase, the roughly ten days between ovulation and the start of your period. But the full explanation involves more moving parts than just “hormones make you want sugar,” and some of the strongest cravings may be shaped as much by culture as by biology.
What Happens to Your Hormones Before Your Period
The menstrual cycle’s two main hormones, estradiol and progesterone, shift dramatically across each month, and those shifts have direct effects on appetite. Estradiol tends to suppress eating. When it rises around ovulation, food intake typically dips. Progesterone does the opposite: it promotes eating. After ovulation, progesterone climbs through the luteal phase while estradiol eventually drops, and together those changes push food intake upward. One study tracking daily hormone levels alongside food diaries confirmed that within-cycle fluctuations in estradiol negatively predicted food intake while progesterone fluctuations positively predicted it, and the two hormones together accounted for the characteristic dip in eating around ovulation followed by increased appetite in the days before menstruation.1Hormones and Behavior. Ovarian hormone fluctuations predict within-cycle shifts in women’s food intake
What makes this relevant to sweet cravings specifically, rather than just eating more in general, is a protein called sex hormone-binding globulin (SHBG). During the luteal phase, higher levels of SHBG were positively associated with cravings for sweet and carbohydrate-rich foods. Women with higher estradiol and a higher estradiol-to-leptin ratio during the luteal phase reported significantly stronger sweet cravings than women with lower levels of those markers.2PubMed. Estradiol, SHBG and leptin interplay with food craving and intake across the menstrual cycle So it is not just progesterone revving up general hunger. The hormonal environment of the late luteal phase appears to selectively amplify the desire for sweet foods.
Your Body Actually Burns More Energy
One reason you feel hungrier before your period is that your body genuinely needs more fuel. Resting metabolic rate, the number of calories you burn just existing, rises during the luteal phase. A meta-analysis pooling data from multiple studies found a small but statistically significant increase in resting metabolism during the luteal phase compared to the follicular phase.3PubMed Central. Effect of menstrual cycle on resting metabolism: A systematic review and meta-analysis The bump is modest, typically estimated at roughly 100 to 300 extra calories per day depending on the individual and the study, but it is enough to create a real energy deficit if you eat the same amount you normally do. Your body registers that deficit and nudges you toward quick energy sources, which often means sweets and simple carbohydrates.
This metabolic explanation is important because it reframes the craving as partly functional rather than purely emotional. Your body is not being irrational when it asks for a cookie. It is burning through more energy and signaling for a top-up. The problem is that the signal does not come with fine-tuned calorie accounting: it arrives as a strong pull toward the most energy-dense options available.
Insulin and Blood Sugar Become Less Stable
Progesterone does not just increase appetite. It also reduces insulin sensitivity, meaning your cells become slightly less efficient at pulling glucose out of the bloodstream. Research comparing the follicular and luteal phases in healthy women found increased insulin resistance during the luteal phase, driven by the higher progesterone levels characteristic of that part of the cycle.4PubMed Central. Blood glucose levels, insulin concentrations, and insulin resistance in healthy women and women with premenstrual syndrome: a comparative study When insulin is less effective, blood sugar can fluctuate more, and those dips are one of the body’s strongest triggers for seeking out sweet, fast-acting carbohydrates.
This creates a feedback loop. You eat something sweet, blood sugar spikes, insulin overcompensates, blood sugar drops again, and the craving returns. Women who are already prone to blood sugar instability may notice this cycle more acutely in the premenstrual window. It also helps explain why the craving is specifically for sweets and not, say, for a steak: the body is chasing rapid glucose rather than sustained energy.
How the Brain’s Reward System Changes
The hormonal shifts of the luteal phase do not just affect metabolism. They also change how the brain responds to food cues. A neuroimaging study found that when women viewed images of sweet foods (compared to savory foods), a key brain region involved in memory, emotion, and reward showed a significantly stronger response during the luteal phase than during the follicular phase.5Communications Biology. The interplay of central insulin and menstrual cycle on functional brain networks and neural food cue reactivity in women In other words, seeing a slice of cake lights up your brain more in the days before your period than it does at other times. The sweet thing is not just more desired; it is more neurologically compelling.
This dovetails with research on leptin, a hormone that normally signals fullness and helps regulate energy balance. A systematic review found that leptin levels tend to rise steadily from their lowest point in the early follicular phase to a peak in the late luteal phase.6PubMed Central. Variation of Leptin During Menstrual Cycle and Its Relation to the Hypothalamic–Pituitary–Gonadal (HPG) Axis: A Systematic Review That might sound like it should suppress appetite, since leptin is often called the “satiety hormone.” But there is evidence that, much like insulin resistance, the luteal phase may involve a degree of leptin resistance as well, where the brain becomes less responsive to leptin’s satiety signal even as the hormone circulates at higher levels. The result is that the normal brake on appetite loosens right when the accelerator (progesterone, reward sensitivity, metabolic demand) is pressed hardest.
Taste Itself Shifts Across the Cycle
Here is something many women notice without quite being able to name: food actually tastes different at different points in the cycle. Research tracking gustatory perception found that women displayed a cyclic pattern with a greater preference for sweet solutions and reduced distaste for salty and sour solutions toward the end of the cycle.7PubMed Central. Does Each Menstrual Cycle Elicit a Distinct Effect on Olfactory and Gustatory Perception? The hormonal environment appears to influence not just what you want to eat but how food literally registers on your tongue. Sweet things taste better, or at least more appealing, when progesterone is high and estradiol is falling.
This sensory shift adds a layer to the craving that goes beyond hunger and mood. Even if you are not particularly hungry, a dessert may simply taste more satisfying in the premenstrual window than it would a week after your period. That perceptual change can make it harder to brush off a craving, because the food really is delivering a more rewarding taste experience in the moment.
The Chocolate Question
Chocolate is the single most commonly craved food during the premenstrual phase, and the standard explanation usually invokes magnesium deficiency. Menstrual blood loss depletes iron and other minerals, the argument goes, and chocolate is relatively rich in magnesium, so the body craves it to restore what has been lost. There is a kernel of plausibility here. Chocolate does contain compounds that interact with neurotransmitter systems involved in mood and reward, and it has been described as a potential form of self-medication for low levels of serotonin and dopamine.8PubMed. Chocolate: food or drug?
But the magnesium explanation has a significant hole in it: if the craving were really about replenishing a mineral deficit, you would expect women worldwide to crave chocolate at roughly equal rates. They do not. A cross-cultural study found that foreign-born women in the United States were significantly less likely to endorse menstrual chocolate craving (about 17%) compared to women born to U.S.-born parents (about 33%) and second-generation immigrants (about 41%). Among second-generation and foreign-born women who did report menstrual chocolate cravings, those women also reported significantly greater acculturation to American culture.9PubMed Central. Does culture create craving? Evidence from the case of menstrual chocolate craving
A separate comparison between American and Spanish women reinforced the pattern: about 40% of American women spontaneously linked their chocolate cravings to their period, compared to only 4% of Spanish women.10PubMed. Chocolate craving and the menstrual cycle Spanish women eat plenty of chocolate, but they apparently do not associate it with menstruation the way American women do. The researchers concluded that culture, not physiology, was the more likely origin of the specific chocolate-period link. The biological craving for something sweet is real, but the fact that it gets channeled into chocolate in particular seems to depend heavily on where you grew up and what cultural narratives you absorbed about periods and comfort food.
Mood, Cravings, and the Serotonin Connection
A common assumption is that premenstrual sweet cravings are driven by low mood: you feel bad, so you reach for sugar. The link between premenstrual mood dips and serotonin (a neurotransmitter involved in mood regulation) is well established. Carbohydrates help the brain make serotonin, so the theory suggests that eating sweets is a form of unconscious self-medication.
The evidence is more nuanced than that tidy story, though. One study tracking cravings, food intake, and mood across the cycle confirmed that both cravings and the amount of food eaten were higher in the luteal phase, and mood was indeed less positive during that window. But crucially, there was no correlation between mood and either cravings or amount eaten.11Elsevier. Food cravings, mood, and the menstrual cycle Women who felt worse did not crave more than women who felt fine. The cravings appear to be driven by the same hormonal machinery described above, running on a parallel track from mood rather than being caused by it. Feeling down and wanting cookies both happen before your period, but one does not seem to cause the other in most women.
When Cravings Are More Intense Than Usual
For women with premenstrual dysphoric disorder (PMDD), a more severe form of premenstrual syndrome, sweet cravings can become genuinely disruptive. Research specifically comparing women with PMDD to controls found that women with PMDD had late-luteal-phase spikes in desire to eat high-sweet foods and in emotional responses to those foods, while control women did not show the same elevations.12PubMed. Premenstrual appetite and emotional responses to foods among women with premenstrual dysphoric disorder A separate study found that women with PMDD had increased sweet cravings and uncontrolled eating from the early to the late luteal phase.13PubMed. Leptin and ghrelin concentrations and eating behaviors during the early and late luteal phase in women with premenstrual dysphoric disorder
The distinction matters because PMDD involves heightened reward sensitivity. Women with the condition showed higher reward sensitivity, more positive emotional responses, and stronger craving responses to high-sweet-fat foods compared to controls.14PubMed. The high-sweet-fat food craving among women with premenstrual dysphoric disorder: emotional response, implicit attitude and rewards sensitivity The brain’s reward circuitry appears to be turned up, making sweet-and-fatty foods feel disproportionately compelling. If your premenstrual cravings feel overwhelming rather than just mildly annoying, and if they come packaged with significant mood changes, irritability, or difficulty functioning, it may be worth discussing PMDD screening with a healthcare provider rather than just writing off the cravings as normal.
Even outside of PMDD, women who meet criteria for PMS report substantially higher food craving scores across all menstrual phases compared to women without PMS. One study found that women with PMS consumed considerably more calories from ultra-processed foods during menstruation as well, and that food cravings and ultra-processed food consumption were both independent predictors of PMS severity.15Wiley Online Library. Premenstrual Syndrome, Ultra‐Processed Food Intake, and Food Cravings: A New Perspective Whether the cravings drive the PMS symptoms or the PMS drives the cravings (or both feed each other) is still an open question, but the pattern suggests that women who experience worse premenstrual symptoms also tend to gravitate more strongly toward highly processed sweet foods.
What About Hormonal Birth Control
You might expect that hormonal contraceptives, which flatten the natural hormonal cycle, would also flatten premenstrual cravings. The evidence is surprisingly mixed. One laboratory study comparing women on oral contraceptives to naturally cycling women found that both groups ate more calories from sweet foods during the luteal phase, and oral contraceptive use did not significantly alter those fluctuations.16PubMed Central. Oral contraceptive effects on food choice during the follicular and luteal phases of the menstrual cycle. A laboratory based study The sweet-craving pattern persisted even when the natural hormonal swings were suppressed by the pill, at least for snack-type foods.
This finding complicates the purely hormonal explanation. If the pill overrides the normal rise and fall of progesterone and estradiol, yet the craving for sweets in the luteal phase remains, something else may be maintaining the pattern. Learned behavior, cultural expectation, or subtler hormonal signals that the pill does not fully suppress could all play a role. For women hoping that going on the pill will eliminate premenstrual sweet cravings, the research suggests it probably will not make a dramatic difference on its own.
The Range of What Gets Craved
While “sweets” gets the most attention, the luteal-phase appetite boost is not limited to sugar. Research tracking food cravings across the full cycle found significant increases in cravings for chocolate, sweets in general, and salty foods during the late luteal phase compared to every other phase.17PubMed Central. Changes in macronutrient, micronutrient, and food group intakes throughout the menstrual cycle in healthy, premenopausal women Another study catalogued a broader list: cravings for pastries, fried snacks, desserts and sweets, sandwiches, chocolate, and sausages were all significantly higher during the luteal phase than the follicular phase.18PubMed Central. Do Food Intake and Food Cravings Change during the Menstrual Cycle of Young Women?
The thread connecting most of these items is caloric density, not just sweetness. When your body is burning extra energy and your insulin is working less efficiently, it tends to seek out calorie-rich foods in general. Sweets get the spotlight because sugar is the fastest path to energy, and because the brain’s reward system happens to respond especially strongly to sweet tastes during this phase. But the craving for salty chips, fried food, or a heavy sandwich comes from the same underlying metabolic pressure. If you find yourself reaching for pizza instead of ice cream before your period, you are experiencing the same phenomenon through a different food preference.
An Evolutionary Lens
Some researchers have tried to place premenstrual food cravings in an evolutionary framework. The luteal phase is the window after ovulation when, in ancestral terms, there was a chance of early pregnancy. Stocking up on calories during that window would have been adaptive: a woman who ate more after ovulating would have had better energy reserves to support a potential pregnancy. Research in consumer psychology found that food-related desires and eating behaviors were greater during the luteal phase, while appearance-related spending and beautification behaviors increased during the fertile phase around ovulation.19Journal of Consumer Psychology. Calories, beauty, and ovulation: The effects of the menstrual cycle on food and appearance‐related consumption
The pattern makes a certain intuitive sense: during the fertile window, energy goes toward attracting a mate; after ovulation, energy goes toward fueling a body that might be supporting new life. Whether this framing tells us anything actionable is debatable, but it does offer a reminder that the premenstrual appetite increase is not a glitch or a weakness. It is a deeply embedded biological program running as designed, even if the modern food environment means it now points you toward a candy bar instead of a handful of wild berries.
Practical Ways to Work With the Cravings
Understanding the mechanisms does not make the craving disappear, but it does suggest strategies that work with your biology rather than against it. Since part of the drive is genuinely increased energy needs, eating slightly more during the luteal phase is not something to feel guilty about. An extra snack or a slightly larger meal that includes protein and fiber alongside some carbohydrates can help stabilize blood sugar and reduce the intensity of the rebound craving cycle that comes from eating sweets on an empty stomach.
The insulin sensitivity dip also means that pairing any sweet food with protein, fat, or fiber will slow glucose absorption and reduce the spike-and-crash pattern. A piece of chocolate with a handful of almonds, or a sweet yogurt with oats, is likely to feel more satisfying and produce less of a rebound craving than the same amount of sugar eaten alone. Eating regular meals rather than skipping them becomes more important in the luteal phase, because the blood sugar instability from fasting is amplified when insulin is working less efficiently.
For women whose cravings are intense enough to cause distress, tracking the pattern can help distinguish between normal luteal-phase appetite and something worth discussing with a doctor. If cravings come with significant mood disruption, social withdrawal, or a sense of being out of control around food, those are markers that push toward the PMS or PMDD end of the spectrum, where treatment options beyond dietary management exist. The craving itself is not the problem to solve in those cases; it is one symptom of a broader hormonal sensitivity that can be addressed more directly.