If you are one of those people who cant eat food or eat little food and you want to stimulate your appetite and eat more food then is for you.
From the article I found this piece, The basic problem is that while it’s true that exercise burns calories and that you must burn calories to lose weight, exercise has another effect: it can stimulate hunger. That causes us to eat more, which in turn can negate the weight-loss benefits we just accrued. Exercise, in other words, isn’t necessarily helping us lose weight. It may even be making it harder.
So, if exercise stimulates hunger, then people who have a poor appetite can stimulate their appetite to eat more food by engaging in exercise.
The desire to eat is prevalent among people who want to gain. A combination of more food and exercise is usually recommended.
For this technique to work the exercise has to be moderate enough to arouse desire to eat. Excessive exercise may lead to drastic weight loss putting negasting the desire to gain weight.