Question

Is sugar very much essential for our body? If yes. How?

Answer 1

Yes,they are made glucose by the body

Answer 2

Sugars are carbohydrates. Like all carbohydrates, they provide a source of energy in our diet. Sugar is a term that includes all sweet carbohydrates, although the term most often is used to describe sucrose or table sugar, a ‘double sugar’. The body breaks down carbohydrates into simple sugars such as glucose, that can be readily used in the body. 
so suger is necessary but not execes of sugar