Metabolism.

Metabolism is the countless series of chemical reactions that take place continuously within an organism, allowing it to live. It includes all physical and chemical processes within the body such as digestion, food absorption, waste elimination, respiration, circulation, and temperature control. In simple terms, your metabolism is the rate at which your body operates to carry out all its bodily functions, like the production of heat, RNA, hair, bones, etc. and the breaking down of …

…slowing down your metabolism to conserve calories, and even cause loss of muscle mass. Many weight loss diet plans involve taking weight loss pills, which often make you lose up to 1.3 -1.8 kg per week. This is unwise because it is both unhealthy and ineffective. Normally, the human body can only lose up to 0.9 kg per week. Anything beyond this level will cause you to lose water instead, which is only detrimental to your health.