Carb diets, catabolism (breakdown) of muscle protein will increase, and protein synthesis stops. . Loss of muscle reasons a decrease on your basal metabolic fee (metabolism). Metabolism happens within the muscle. Less muscle and muscle tone manner a slower metabolism which method fewer energy burned hours-a-day. Five. Your muscle groups and skin lack tone and are baggy. Saggy muscle mass don't appearance suitable, motive baggy skin, and purpose you to lose a wholesome, colourful look (even in case you've additionally lost fats).