Anabolic processes tend toward "building up" organs and tissues . These processes produce growth and differentiation of cells and increase in body size, a process that involves synthesis of complex molecules . Examples of anabolic processes include the growth and mineralization of bone and increases in muscle mass. Endocrinologists have traditionally classified hormones as anabolic or catabolic, depending on which part of metabolism they stimulate. The classic anabolic hormones are the anabolic steroids , which stimulate protein synthesis, muscle growth, and insulin .  The balance between anabolism and catabolism is also regulated by circadian rhythms , with processes such as glucose metabolism fluctuating to match an animal's normal periods of activity throughout the day. 
The abuse of anabolic steroids by high school, college and other amateur athletes is a dangerous practice. Participants in amateur sports must be made aware of the physical and emotional dangers associated with steroid abuse. The "win at any cost " attitude embraced by some athletes must be redirected and replaced by personal dedication to the sport; a thorough knowledge of the sport's physical demands and requirements; maintenance of a healthy lifestyle; and, an appreciation of the satisfaction that comes from participation.