In some other cases, the excess body weight is actually due to the fat deposits.
Avoiding fat intake for a few days and increasing the intake of protein-rich food and carbohydrates helps in utilizing the existing fat deposits for the body metabolism, thus reducing the fat deposits in the body.

The second effect is to counteract acidity. The byproducts of protein are acidic. Vegetables are very alkaline (the opposite of acidic). For optimal health and function, the body should be slightly alkaline. Eating generous amounts of fruits and vegetables will accomplish this.