Does low testosterone cause weight gain?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Low testosterone can contribute to weight gain by reducing lean muscle mass, slowing metabolism, and increasing fat storage—especially around the abdomen. However, weight gain is rarely caused by one factor alone. Diet, sleep quality, stress, thyroid function, medications, and other hormonal imbalances also play major roles. Because symptoms of low testosterone (fatigue, low libido, mood changes, weight gain) overlap with many other conditions, identifying the true cause requires a careful review of your full symptom picture.

If you're noticing unexplained weight gain alongside other changes in energy, mood, or sexual health, don't guess—get clarity. A free, instant, online symptom check can help you understand what may be driving your symptoms and guide you toward the right next steps, whether that's lab testing, a specialist visit, or lifestyle adjustments. It takes just a few minutes and could save you weeks of uncertainty.

Reviewed for medical accuracy: 07/15/2026

Important Next Steps

Understand if low testosterone explains weight gain Discover other causes of your weight gain See whether low testosterone needs care today Find OTC options for weight-related concerns Find a doctor for low testosterone evaluation Learn medically valid home remedies for weight gain Find out if symptoms suggest low testosterone

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Explanation

Testosterone helps build muscle and keeps metabolism running well. When testosterone levels are low, a man might lose some muscle and gain extra fat, especially around the belly. This change in body makeup can lead to weight gain over time.

Some studies have shown that men with low testosterone often have more body fat and that treatments to boost testosterone might help improve their weight. However, it's important to remember that many things affect weight, such as diet, exercise habits, and overall health. Low testosterone is just one piece of the puzzle when it comes to weight gain.

If you are concerned about your weight or hormone levels, it's a good idea to talk with your doctor. You can also use a free symptom checker to help identify potential causes of your symptoms before your appointment. They can check your testosterone levels and help make a plan that might include lifestyle changes, hormone treatments, or other approaches to help manage your weight.

(References)

Kelly DM, Jones TH. Testosterone and obesity. Obes Rev. 2015 Jul;16(7):581-606. doi: 10.1111/obr.12282. Epub 2015 May 15. PMID: 25982085.
Fernández-García JC, Barrios-Rodríguez R, Asenjo-Plaza M, et al. Metformin, testosterone, or both in men with obesity and low testosterone: A double-blind, parallel-group, randomized controlled trial. Metabolism journal. 2022;136(155290):1-10. doi:10.1002/oby.23695.

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