Are you talking about a 1500 kcal diet? Is there even a diet like that? I've always thought that kilo calories were way bigger than calories, and a person would have to be enormous to consume 1500 kilo calories every day. I guess you're trying to ask about a 1500 calorie diet, which would be an ideal diet that people can follow. Yes, it is possible to lose weight through a 1500 calorie diet because this amount if lesser than what the body needs and the body will try and burn some excess fat to make up for this deficit.