There are several miracle diets in the market that lead to successful weight loss if you follow them exactly as they are designed. That doesn't mean every food that fits into a diet is healthy, and it does mean you have to deprive yourself of many foods and nutrients that are essential for good health. These diets if followed for too long are very capable of causing serious problems to people's health.
The main issue with these diets is that the weight we worked so hard to lose comes back when we return to our usual eating habits. So, we return to a diet, we lose the weight once more, and go up and down and up and down. This way we play with nature and mess up our own metabolism. Body fat levels increase, and it becomes harder and harder to maintain a healthy body weight.

For health care professionals worldwide and especially for dieticians healthy eating means three things: balance, variety and moderation. In short, that means eating a wide variety of foods without getting too many calories or too much of any one nutrient. As guidance to achieving this, food guide pyramid was created.