Pregnancy cravings are driven by a combination of hormonal shifts, changes in brain chemistry, heightened sensory perception, and rising energy demands. No single mechanism fully explains them, which is why researchers describe cravings as a product of multiple overlapping biological and psychological forces. An estimated 50 to 90 percent of pregnant women in the U.S. experience cravings for specific foods, with sweets, salty carbohydrates, animal protein, fruit, and dairy topping the list.
Hormones Reshape Appetite Signals
The hormonal environment of pregnancy is dramatically different from your baseline. Progesterone, which normally drops during each menstrual cycle, stays elevated and continues to climb thanks to human chorionic gonadotropin (hCG), the hormone your body produces to sustain the pregnancy. Estrogen also rises significantly during the second and third trimesters. Together, these shifts rewire the signals your body uses to regulate hunger and food preferences.
Outside of pregnancy, estrogen generally suppresses appetite and protects against binge eating. During pregnancy, those effects disappear. Research in animals shows that estrogen’s ability to burn fat through heat generation in fat tissue, a process that normally helps regulate weight, shuts off entirely in pregnant subjects. Progesterone compounds the effect by actively counteracting estrogen’s appetite-suppressing properties. The result is that the hormonal combination unique to pregnancy creates conditions where your body is primed to eat more, and to seek out specific types of food, in ways it wouldn’t otherwise.
It’s the interaction between high levels of both hormones that appears to matter most. Studies on the menstrual cycle show that when progesterone and estrogen are both elevated simultaneously, emotional eating increases. Pregnancy amplifies this dynamic to an extreme degree, which helps explain why cravings feel so intense and hard to ignore.
Your Brain’s Reward System Gets Turned Up
Pregnancy physically changes how your brain responds to food. Research published in 2025 found that in pregnant mice, the reward pathway connecting the midbrain to the pleasure center fires significantly more during eating than it does in non-pregnant animals. Downstream, the chemical messenger dopamine floods the brain’s reward hub at higher levels during meals, especially when calorie-dense food is involved.
This means the “hit” of satisfaction you get from eating foods you crave is likely stronger during pregnancy than at any other time. The same study found that pregnancy increases the reward system’s sensitivity to energy deprivation, so when your body senses it needs calories, the drive to seek out food becomes more powerful. This could explain why certain cravings feel almost compulsive, and why they often center on calorie-dense options like chocolate, pizza, cheese, and steak.
Rising Energy Demands Create Real Hunger
Your body’s calorie needs increase steadily across pregnancy, and the timeline matches up with when cravings intensify. Resting metabolic rate rises by about 60 calories per day during the first trimester, a modest bump. But during the second and third trimesters, it jumps by roughly 390 calories per day. Total daily energy expenditure climbs by an average of 420 calories per day from pre-pregnancy to delivery.
Current guidelines suggest eating an extra 100 to 200 calories per day in the first trimester, about 340 extra in the second, and roughly 450 extra in the third. That’s the equivalent of adding a substantial snack or small meal each day by late pregnancy. Your body registers this growing energy gap, and cravings may be one way it pushes you toward calorie-rich foods to close it. The fact that the most commonly craved foods (sweets, pizza, chips, red meat, cheese) are all calorie-dense supports this idea.
Taste and Smell Change Dramatically
Many pregnant women notice that food tastes different, sometimes metallic or just “off.” This is dysgeusia, a shift in taste perception driven by the same hormone surges responsible for other pregnancy symptoms. It’s most common in the first trimester and usually fades afterward. Since roughly 80 percent of what you perceive as taste actually comes from your sense of smell, the heightened smell sensitivity many women experience in early pregnancy amplifies the effect.
These sensory changes work in two directions. Foods you previously enjoyed may suddenly seem repulsive, while foods you rarely thought about may become intensely appealing. When your usual diet becomes harder to tolerate, cravings for specific “safe” or satisfying foods can fill the gap. This is one reason cravings and food aversions often develop in tandem during the first trimester.
The Nutritional Deficiency Theory
A popular explanation is that your body craves what it’s deficient in: you want red meat because you need iron, or you crave dairy because you’re low on calcium. There’s a kernel of logic here, but the evidence is mixed. A large study of 500 pregnant women in Jordan found that among those who experienced cravings, 40.6 percent had iron deficiency and 29.1 percent had vitamin D deficiency. Anemia was significantly associated with cravings in that population.
The problem is that most commonly craved foods don’t align neatly with common deficiencies. Chocolate is the most frequently craved food in many studies, and while it contains some magnesium, there are far richer sources that pregnant women don’t typically crave. If the body were simply requesting nutrients it lacked, you’d expect cravings for leafy greens and organ meats to dominate, and they don’t. Nutritional gaps may contribute to some cravings, but they don’t explain the overall pattern.
When Cravings Turn Into Pica
In some cases, pregnancy cravings extend beyond food entirely. Pica is the craving and deliberate consumption of non-food items like ice, dirt, clay, raw starch, chalk, or charcoal. It’s been documented for over 2,000 years, with the first known description attributed to Hippocrates around 400 BCE, and it’s most common in pregnant women and young children.
Unlike typical food cravings, pica has a clearer connection to nutritional deficiency. The link between pica and iron-deficiency anemia has been observed since at least 30 AD, and modern research has confirmed a direct biochemical relationship. In one landmark study, researchers were able to stop pica entirely by correcting participants’ iron levels. If you find yourself craving ice, dirt, or other non-food substances during pregnancy, it’s worth having your iron levels checked, since many of these substances can be harmful if consumed regularly.
Personality and Psychology Play a Role
Cravings aren’t purely biological. A 2024 study of 500 pregnant women in Jakarta found that personality traits significantly influenced craving intensity. Women who scored high on neuroticism, a trait characterized by heightened emotional reactivity and stress sensitivity, were more than nine times as likely to experience food cravings compared to women who scored low. This suggests that the emotional landscape of pregnancy, the anxiety, mood swings, and stress, can amplify the biological drive to seek comforting or rewarding foods.
Cultural context matters too. Studies in the U.S. consistently find that pregnant women crave sweet, fatty, and carbohydrate-rich foods like cakes, chocolate, and sugary drinks. In Ethiopia, 58.3 percent of pregnant women reported cravings, but the specific foods they desired and the factors driving those cravings were more closely tied to socioeconomic conditions and undernutrition. What you crave is shaped partly by what’s available, familiar, and culturally associated with comfort.
When Cravings Start and How Long They Last
Cravings can appear as early as five weeks into pregnancy, but they more commonly develop toward the end of the first trimester. They intensify during the second trimester, which is when most women report them at their strongest and most frequent. By the third trimester, cravings typically begin to ease, though they can persist until delivery.
This timeline lines up with the hormonal and metabolic changes described above. The second trimester is when estrogen levels are climbing steeply, energy demands are ramping up, and the first-trimester nausea and taste disturbances that may have suppressed appetite are fading. Your body is simultaneously burning more calories and better able to tolerate food, creating the perfect conditions for strong, specific cravings.