Yes, progesterone can cause increased appetite
Progesterone and synthetic progestins are well-established appetite stimulants with high-quality evidence demonstrating significant increases in appetite and food intake. This effect is particularly well-documented in clinical settings where progestins are used therapeutically to treat anorexia and cachexia.
Evidence from Clinical Guidelines
The most robust evidence comes from oncology guidelines where synthetic progestins (megestrol acetate and medroxyprogesterone acetate) are specifically recommended as appetite stimulants. The 2017 ESPEN Guidelines on Nutrition in Cancer Patients provide high-level evidence that progestins increase appetite and body weight 1. Multiple systematic reviews analyzing over 30 randomized clinical trials involving more than 4,000 patients consistently demonstrate that:
- Megestrol acetate significantly increases appetite and promotes weight gain at doses of 160-1600 mg daily, with optimal dosing between 480-800 mg daily 1, 2
- Medroxyprogesterone acetate (MPA) significantly increases appetite and caloric intake at doses of 200-1200 mg daily 2, 3
The 2006 ESPEN Guidelines similarly recommend steroids or progestins to enhance appetite and prevent weight loss in cachectic patients 3.
Mechanism in Pregnancy
In pregnancy, natural progesterone affects appetite through different mechanisms. The 2024 AGA Clinical Practice Update notes that elevated progesterone levels during pregnancy cause delayed gastric emptying and inhibit GI motility 4. While this primarily contributes to nausea and heartburn rather than increased appetite, the hormonal effects on the gastrointestinal system are well-established.
Research Evidence on Appetite Stimulation
Animal and human studies provide mechanistic insights:
- Progesterone treatment in female rats increases food intake, body mass, and adipose tissue by upregulating neuropeptide Y (NPY) and downregulating cocaine- and amphetamine-regulated transcript (CART) in the hypothalamus—key appetite-regulating pathways 5
- A 2012 review confirms that progesterone may stimulate appetite while estrogen inhibits food intake 6
- Clinical trials in cancer patients show that MPA at 500 mg twice daily increases energy intake by 426 kcal/day and increases fat mass by 2.5 kg over 12 weeks 7
Important Caveats and Context
Dose-Dependent Effects
The appetite-stimulating effects are most pronounced with pharmacological doses of synthetic progestins (hundreds of milligrams daily) used therapeutically, not necessarily with physiological doses of natural progesterone 1, 2, 7.
Side Effect Profile
When progestins are used as appetite stimulants, clinicians must weigh benefits against serious risks:
- Thromboembolism risk is significant and consistently documented 1, 3
- Other side effects include edema, vaginal spotting, and impotence 1
- The FDA label for progesterone capsules lists potential side effects including abdominal bloating, nausea, and weight changes 8
Variable Effects by Context
Recent research suggests context matters:
- In post-menopausal ovariectomized rats, progesterone treatment actually reduced food intake and body weight, contrasting with pre-menopausal effects 9
- Effects may differ between natural progesterone and synthetic progestins 10
- The 2016 systematic review found that current evidence does not support progesterone therapy for non-cancer cachexia, though it may have limited use as an appetite stimulant in palliative contexts 11
Contraceptive Formulations
In hormonal contraceptives, progestins are combined with estrogens, and the net effect on appetite depends on the balance between these hormones. The 2011 AACE guidelines note that progestin side effects can include bloating and fluid retention, which may be perceived as appetite changes 10.
Clinical Bottom Line
Progesterone and synthetic progestins definitively increase appetite through central nervous system mechanisms affecting hypothalamic appetite-regulating neuropeptides. This effect is dose-dependent, most pronounced with high-dose synthetic progestins, and clinically utilized in cancer-related anorexia. For women taking physiological doses of progesterone (for contraception, hormone therapy, or pregnancy support), appetite effects are generally milder but can still occur, particularly manifesting as increased food intake and potential weight gain through fat mass accumulation rather than lean body mass 1, 5, 7.