Optimal thyroid function is desirable for maintaining leanness, energy, libido, and facilitating weight loss.

“this sort of essential thermostat that your body has that tells your body where the metabolic rate should be and guess what if you want to stay lean if you want to be healthy and have energy and feel good and have libido or if you want to lose weight you want your body's metabolism to work well you want your thyroid to be moving your body's thermostat to the highest level possible at all times”