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Birth Control & Women's Health

Does High Prolactin Cause Weight Gain?

Linda Girgis | MD

Medically reviewed by Linda Girgis | MD, Girgis Family Medicine on August 20th, 2026.

Yes, high prolactin levels can cause weight gain through multiple mechanisms. Elevated prolactin disrupts normal metabolism by interfering with insulin sensitivity and glucose regulation, leading to increased fat storage. Studies show that prolactin levels above 25 ng/mL in women and 15 ng/mL in men often correlate with unexplained weight gain of 10-30 pounds. High prolactin also suppresses sex hormones like estrogen and testosterone, which normally help maintain healthy body composition. Additionally, prolactin can increase appetite and cravings for high-calorie foods while reducing energy expenditure. Weight gain from hyperprolactinemia typically occurs gradually over months and may be more pronounced in the abdominal area.

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