11/02/2026
There’s a lot of talk about testosterone out there, both in medical circles and (especially) on everyone’s social media feed. And rightly so- testosterone plays a key role in muscle mass, bone density, energy, mood, cognition, and sexual function. Symptoms such as low libido, fatigue, reduced motivation, or changes in body composition may reflect low testosterone, although they have many possible causes.
Testosterone levels decline gradually with age, but for most men age is not the primary driver. Nutrition, physical activity, sleep, and stress have a greater influence, and all of these are modifiable.
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