#5: Going on very low calorie diets (VLCD)

Research has shown little to no difference in the weight loss rate of 1200 calorie diets and 800 calorie diets. The 1200 calorie threshold is the point where further calorie restriction does not yield faster results. Diets in the range of 800 to 1200 calories a day suppress the resting metabolic rate from the very first day and after some weeks on these diets, the metabolic rate has dropped by up to 20%. This metabolic drop is just a consequence of the calorie restriction factor; other factors such as the level of leanness may further depress the calorie expenditure.

A big percentage of the quick initial weight loss on a VLCD is water. VLCDs create an illusion of fast fat loss, while in reality most of the weight loss is water. It is hard to continue a very low calorie diet for a prolonged time because the harsh calorie restriction makes you hungrier than ever. People on VLCDs often lack energy and move very little. When you stop the diet, you are prone to instant overeating. Eating a very low calorie diet is the ticket to yo-yo dieting.

Instead of using very low calorie diets, I recommend diets with a mild calorie restriction and an emphasis on exercise. Overweight people who know what they are doing can employ VLCDs for a limited time. It is important to get enough vitamins and minerals from supplements, because such low calorie diets are woefully inadequate in nutrients. Water intake should be high.

Bodybuilders, powerlifters and athletes must stay away from very low calorie diets because the large calorie restriction causes a greater proportion of the weight loss to be muscle loss.