Types of Weight Loss Techniques There are many methods available for trying to lose weight. Restrictive diets are among the best publicized. These include calorie restriction, in an attempt to take in less energy than you expend, as well as diets that restrict food by type, such as low fat, low carbohydrate and low sugar diets. In addition to using restrictive diets, some people also attempt to significantly increase their activity. This has a similar effect to that of a calorie restricting diet, but it increases the amount of energy spent rather than decreasing what goes in.