According to Got Questions, not only is gluttony a deadly sin but over eating is also a sin. Many Christians, including Pat Robertson, frequently make references that God is against dieting or low carb dieting. The lack of self control is not a quality God would encourage. In fact, one of the seven deadly sins is gluttony.
Many people falsely believe that gluttony was referring to wine or other activities, which at the time of Christ, was a big problem. However, why is engorging on food any different? Many Christians would never drink several glasses of wine or a cocktail after dinner, but they can’t stop shoveling the food fast enough, including multiple plates of food.
Proverbs 23:20-21 warns us, “Do not join those who drink too much wine or gorge themselves on meat, for drunkards and gluttons become poor, and drowsiness clothes them in rags
The ability to say “no” to anything in excess—self-control—is one of the fruits of the Spirit common to all believers (Galatians 5:22).
The ability to say no to anything, that is food, drugs or alcohol, is dependent on a high level of self control. The fact is if you cannot control your physical appetite, you will be less likely to control other areas of your life, such as lust, anger, excessive spending on material things, etc. You do not have to let your appetite for foods control you. People can have power over it, and lose weight.
The fact is God blessed this earth with many fruits and vegetables, if people eat more natural, God given foods, obesity would not be so common. Aside from the health aspect of gluttony, it also drains your money. Do you think Obesity is a sin?