Final answer:
Energy storage is the process by which the body tissues build and maintain surplus stores of glycogen and fat for use in times of increased needs.
Step-by-step explanation:
The process of storing surplus energy in the form of glycogen or fat for later use is known as energy storage. During times of increased needs, the body tissues can tap into these stores to meet the demand. Excess carbohydrate is converted into glycogen, which is stored in the liver and muscle cells, while excess glucose and dietary fat are stored as fat in adipose tissue.