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Muscle growth and low testosterone:

Testosterone is one of the most important hormones in the body. It is the male hormone and is responsible for the growth of muscles and maintain the physique of a man. Testosterone causes the production of neurotransmitters in the body that cause tissue growth and it also increases the level of growth hormone (GH). Thus more exercise leads to muscle growth. However, if the testosterone level is low then it will lead to muscle weakness and more fat production leading to obesity. Without testosterone, muscle is degraded and will turn into fat.

Fats, especially in the abdominal part of the body, produce an enzyme called aromatase which converts testosterone into estrogen and estrogen is responsible for the production of more fats. An increase in testosterone will reverse fat accumulation and increase lean body mass. Testosterone is the key hormone of males and separates men from women. In women, it is 1/10 of the amount in men. In men, it gives male characteristics such as aggressiveness, deep voice, sex drive, confidence, increased muscle mass and facial hair growth.

Loss of testosterone with aging causes sarcopenia (a condition of loss of skeletal muscle mass) and decreased performance and physical functioning, restoration of testosterone to youthful level is necessary for an increase in the synthesis of myofibrillar proteins, muscle strength, and total body cell mass.