Diet shakes, also known as meal replacement shakes, are beneficial for losing weight and maintaining control of calories consumed, according to WebMD. They are also useful for those who want to lose weight but don't have time to prepare healthy meals with whole ingredients.
Diet shakes used at the beginning of a diet may help jump-start the weight-loss process. Dieters often use shakes for the first few months of the diet and then gradually ease back to regular meals. Generally, diet shakes replace smaller meals, including breakfast and lunch, and the dieter adds a sensible dinner and healthy snacks to the regimen.