Well Said by Pst John Bevere
A diet may change the way you look, but a fast will change the way you live. A diet may change your appearance, but a fast will change the way you see. Both are a restriction of food but the difference lies in the purpose of motive that inspires them. A diet is designed to help you lose or gain weight. A change of diet may also be initiated to improve or correct health problems. Dieting is a natural physical application that alters our physical well-being, weight, or health. It changes the way we look or feel.
Fasting is not for weight gain or loss. Nor is it limited to natural healing. It is not designed to change the way we look and feel but to change the way we perceive and live. A diet may change the way you look, but a fast will change the way you live. A diet may change your appearance, but a fast will change the way you see; it will alter your inner perspective. The world has perverted and reduced the fast, diminishing it to a diet. As such, it is not a spiritual renewal, but a physical one. The deepest transformations are wrought from the inside out.
Before my confrontation with truth, I’d only fasted to lose weight. Granted, I might have done a combination fast and diet, using reasoning such as this: I need to lose weight, and I need direction, so I’ll fast and accomplish both. But on this type of fast, food and weight are still the focus. I have searched the Scriptures and found no reference in God’s Word to a fast prescribed for weight loss.
Your focus or motive on a fast will be your reward. If God isn’t the center, it will be reduced to merely a time of denial.