It is day 22 of your cycle and you would genuinely commit a minor crime for chocolate. Or carbs. Or both. The fridge has been raided twice since dinner and you are wondering whether a third trip is socially acceptable.
This is not greed, emotional eating, or a failure of discipline. It is physiology. Your basal metabolic rate is measurably higher, your appetite hormones have shifted, and your brain is requesting specific nutrients. The cravings have a purpose.
Your metabolism genuinely increases
This is not a wellness myth — it is one of the most replicated findings in menstrual cycle research. Basal metabolic rate (BMR) increases by 100–300 calories per day during the luteal phase. The original landmark study was published in the American Journal of Clinical Nutrition (1989) by Webb, and it has been confirmed by numerous studies since.
The mechanism is progesterone. After ovulation, progesterone rises sharply to support potential implantation. Progesterone is thermogenic — it raises core body temperature by 0.3–0.5°C. Maintaining that elevated temperature costs energy. Your body is doing more metabolic work, and it signals this by increasing appetite.
A 2016 study in Appetite quantified it: women consumed an average of 238 additional calories per day in the luteal phase compared to the follicular phase, almost perfectly matching the metabolic increase. Your body knows what it needs.
Why carbohydrates specifically
The craving for carbohydrates — bread, pasta, chocolate, biscuits — is not random. It is driven by serotonin.
As oestrogen drops in the late luteal phase, serotonin production decreases. Carbohydrate consumption triggers an insulin response that facilitates tryptophan transport across the blood-brain barrier, where it is converted to serotonin. In other words, eating carbs is a form of self-medication for low serotonin. Your brain is requesting carbohydrates because they genuinely improve your neurochemistry.
Judith Wurtman's research at MIT (1995) demonstrated this directly: women with PMS who were given a carbohydrate-rich drink showed significant improvement in mood and decreased tension within 90 minutes. The effect was specific to carbohydrates — protein-rich drinks did not produce the same result.
Carbohydrate craving during the luteal phase is not a behavioural problem. It is a neurochemical solution the brain has identified for a serotonin deficit.
— Dr Judith Wurtman, MIT Clinical Research Centre
Why chocolate, specifically
Chocolate cravings before menstruation are so common they have been the subject of dedicated research. A 2004 study in Appetite found that 50% of American women craved chocolate specifically around their period. The reasons are layered.
- Magnesium — dark chocolate is rich in magnesium (64mg per 28g serving), which drops in the luteal phase. Magnesium supports GABA receptor function and reduces anxiety.
- Theobromine and phenylethylamine — mild mood-boosting compounds unique to chocolate
- Endorphin release — the combination of sugar and fat triggers opioid receptor activation
- Serotonin boost — the carbohydrate content supports tryptophan uptake
- Cultural permission — chocolate is one of the few "allowed" indulgences, so craving energy gets channelled into a culturally acceptable food
How to work with cravings, not against them
Restricting food during the luteal phase is counterproductive. Your body genuinely needs more energy. Fighting cravings increases cortisol, worsens mood, and typically leads to larger binges later. A 2013 study in Eating Behaviors found that rigid dietary restraint during the premenstrual phase predicted higher caloric intake overall, while flexible eating predicted stable intake.
A practical approach
- 01.Accept the extra hunger — you need 100–300 more calories per day. This is not overeating; it is meeting demand.
- 02.Choose complex carbohydrates first — whole grains, sweet potatoes, oats, and legumes provide sustained serotonin support without the blood sugar crash of refined carbs.
- 03.Pair carbs with protein and fat — a slice of sourdough with nut butter is more satisfying than a biscuit because it slows glucose absorption.
- 04.Include magnesium-rich foods — dark chocolate, pumpkin seeds, almonds, spinach. These address a genuine luteal phase mineral need.
- 05.Do not skip meals — skipping meals when your metabolism is elevated drops blood sugar faster, intensifying cravings and irritability.
Phase Tip
Build a "luteal snack box" during the follicular phase when your cravings are low and decision-making is clearer. Stock it with dark chocolate (70%+), mixed nuts, dried mango, oat bars, and nut butter sachets. When the cravings hit, the box is ready. This removes the decision fatigue of choosing between pantry options at 9pm.
When cravings become a concern
Normal luteal phase hunger resolves within a day or two of menstruation. If your cravings feel out of control, lead to distressing binge episodes, or persist throughout your entire cycle, speak with your GP. Binge eating disorder and premenstrual exacerbation of eating disorders are distinct conditions that benefit from targeted treatment.
For most women, though, premenstrual hunger is simply your body communicating a genuine metabolic need. The radical act is listening to it.