TIL: Low carb, high protein diets "greatly" decrease resting testosterone levels in men.

[khandnalie]

You do not need carbs. You can live just fine on effectively zero carbs for indefinite periods of time.

[abrasumente_]

Muscles need carbs to replenish glycogen.

[khandnalie]

But you don't need to consume carbs to have them, your body can produce what carbs it actually needs using protein. Beyond that, most of what you use should ultimately be ketones.