You literally have no idea what you are talking about. It has to with lowering your calorie intake as well as adjusting your macro-nutrients. Look up "cutting" in google. For instance someone who is in great shape may want to "cut" around summer to get a better beach body. It does not mean your unhealthy, you are just conditioning your body to respond the way you want to.
Same thing goes for someone competing in a competition.
Same thing goes for someone competing in a competition.