You see, your total daily calorie intake is BY FAR the most important aspect of weight loss. Eat the right amount per day and you will lose weight regardless of where those calories came from. However, the foods and nutrients supplying those calories still do play many important roles in your diet and health for various reasons. As far as these "calorie suppliers" go, there's mainly just three; protein, carbs and fat. Despite what the many fad diets and commercial diet plans have scared you into thinking, your weight loss diet CAN and SHOULD contain a good amount of all three. (Exactly how much of each is coming up next.)
So, while you will definitely lose weight just as a result of being below your maintenance level, how much and what types of protein, carbs and fat you eat will indeed play many important roles in your overall weight loss results. Don't worry, I'll explain all of that next.