Meal replacement shakes became popular in the 1990s, despite the claims of dietitians and nutritionists that they were unhealthy and would cause problems such as anorexia. By 2009, they had made a comeback, with many brands of protein shake on the market
How Shake Replacement Diets Work
One or two daily meals are replaced by a grating drink. In addition, you should eat a low-calorie evening meal and one or two healthy snacks, such as fruit or a diet bar, for a total daily calorie intake of around 1200-1400. Because caloric intake is less than your body’s minimum requirement, it will begin to burn fat stores and you lose around 1-2 pounds per week.
Recognized meal replacement shakes contain all the nutrients your body needs every day, from each of the six major food groups, and about 5 grams of fiber. They are quick and convenient, with little or no preparation involved, and it is not necessary to calculate the calories, as this is already done for you.
This type of diet can be unsatisfying and boring, making it difficult to stick to. Shakes are also quite expensive to buy. Some supplements experts, Dr. Hillary M. Wright, MED, RD, a nutritional adviser at Harvard Vanguard Medical Associates, believes that, because this type of diet not retrain your eating habits, you’re probably going back to bad habits and regain weight afterwards. Meal replacement shakes are unsuitable for people who are lactose-intolerant, since they contain skim milk.