What do you mean sheep eat grass?

"Sheep eat grass" is a metaphor, not a literal meaning. In fact, it refers to a kind of eating habit, that is, eating a small amount many times, just like sheep eating grass, in order to achieve the goal of balanced nutrition. This kind of eating habit is thought to help keep healthy. Its advantage is that it can reduce the burden on the stomach and avoid the physical burden caused by eating too much food at one time.