Foods such as fruits and vegetables have low "energy density". Recognize what is causing the weight gain: usually overeating or eating a poor combination of foods. Eating out too much: If your busy schedule or desire for convenience has you eating out most of the time you have very little control over the foods you consume.
Some people are OK with how they look and they simply have no desire to look like a movie star or a bikini model but maybe they need an easy way to lose body fat quickly. Maybe they have a special occasion that they want to drop a few pounds for. Maybe they met someone and they want to look amazing for that person. Whatever the reason may be these people need an easy way to lose body fat that is healthy and isn't going to cost an arm and a leg.