The fact is, your body can only process about 350 calories every 90 minutes. Eat more than that, and you're most likely overloading your digestive system. If your body cannot use all the "fuel" you provide it at any given time, it will use what it can (and only what it can), and then store the rest as body fat. It assumes, through thousands of years of experience, that there will be "lean" times when it will need those fat reserves for fuel. But in this modern age, we, thankfully, seldom face those lean times.
Because of this, if we are to keep our weight from spiraling out of control, we must, by CHOICE limit our quantities of food, as well as the KINDS of food.
So, how do we use this information in losing weight? Simple. Eat light, but eat often. There are many benefits to this strategy. First, you are only providing your body what it needs, when it needs it. Second, you are able to better maintain a consistent blood sugar level, and so you're not left feeling tired all day.
And by making certain wise and healthful choices, you will find the 350 calorie limit CAN be quite filling. Make poor choices, however, and you'll be left feeling unsatisfied. So be sure to choose healthful fruits & vegetables and limit your intake of breads & cereals (these calories will add up fast). Also, when including meat in the diet, choose ONLY healthful, low-fat fish & fowl.
This one simple tip, if practiced FAITHFULLY, will help you achieve your weight loss goals.