Bar Shattya,
The main thing to keep in mind is to stay away from the people who think dieting should be done in a healthy way. Seriously. A tiny bit of logic aught to help you. People who eat healthy don’t lose weight. If they did people would just disappear into nothingness by eating healthy. But they don’t. Healthy people stay the same weight. If you want to lose weight you have to do something unhealthy.
Your statement is cute, but incorrect. If it were true, than we’d see people who ate in an unhealthy way gain wait until they exploded. A person’s weight maintenance is determined in part by how much he consumes (calories in) and how much he exercises (calories out). If either of those factors change, the person’s weight will change in response and then reach a new equilibrium.