The righteous eateth to the satisfying of his soul: but the belly of the wicked shall want. -Proverbs 13:25 KJV
Teenage boys can certainly seem wicked with the way they treat each other and can seem selfish. The proof, based on this verse, would seem to be that their bellies are always wanting more food!
Obviously, this is not what this passage is about.
Recently, a new round of studies was released again confirming the benefits of intermittent fasting. And what does the Bible teach? Fasting, as a way to draw nearer to God and seek His direction, is expected of the faithful.
Those who regularly fast tend to appreciate food more appropriately. They typically eat healthier, because coming out of a fast properly matters. And when it is known food will not be consumed for a time, they want good food in them before and after to remain healthy.
They may also be more appreciative of the food they receive.
But there is purpose.
They tend to be seeking God, even when eating.
But wicked people may not only think fasting is stupid but mock those who do. Or they think those who fast are either judgmental or legalistic.
And, instead, their stomachs become their gods. (Just look at the number of restaurants, eating fads, and TV shows about food in our Western culture.)