Should I eat more during the luteal phase?

Research suggests basal metabolic rate increases by roughly 100–300 kcal/day in the luteal phase. If you are hungry, eating modestly more is physiologically appropriate. Ignoring this increased need can increase cravings and may contribute to binge-restrict cycling.

Do I need iron supplements if I menstruate?

Not automatically, but menstruation is the primary reason iron deficiency is more common in menstruating individuals. A ferritin test (not just hemoglobin) reveals whether stores are depleted. Many functional medicine practitioners flag ferritin below 30 ng/mL as suboptimal, even when hemoglobin is normal.

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Nutrition by Menstrual Cycle Phase

Iron needs increase during menstruation, insulin sensitivity shifts between phases, and caloric expenditure rises in the luteal phase. Here's what the evidence says about nutrition across the menstrual cycle.

The menstrual cycle creates a shifting metabolic environment. Estrogen and progesterone do not just regulate reproduction — they influence insulin sensitivity, substrate utilization, caloric expenditure, and appetite. Understanding these shifts helps explain why the same diet can feel different in different phases and where targeted nutritional attention actually has evidence behind it. This article is for educational purposes and is not medical advice. Consult a healthcare provider or registered dietitian for personalized nutrition guidance. The Evidence: Phase by Phase Menstrual Phase (Days 1–5) Iron. Menstrual blood loss depletes iron. Average menstrual blood loss is 30–40 mL per cycle, but heavy periods can exceed 80 mL. Each milliliter of blood contains approximately 0.5 mg of iron. Over a year, this adds up — menstruation is the primary driver of the higher iron deficiency rates observed in people who menstruate. Iron rich foods during and immediately after menstruation support replacement: red meat (most bioavailable heme iron), lentils, beans, spinach, and fortified cereals provide non heme iron. Pairing non heme iron sources with vitamin C (citrus, bell peppers, tomatoes)