What is Irisin?

Irisin is an enzyme which is secreted from muscle in response to movement (i.e. exercise).

This protein is also called the exercise hormone and may help in converting white fat (WAT) to brown fat (BAT).

It may help fight obesity and diabetes. 

How much fat should a person lose in order to make them look more attractive?

A study conducted by the Department of Psychology at the University of Toronto found that women and men of average height needed to loose about 3.5-4 kg (8-9 lbs) before the weight loss showed in the face.

The study shows that about twice that amount of weight needed to be lost before people were found to be more attractive.

Women needed to loose proportionally less weight then men. For women loss should be about 14 pounds and men 18 pounds.