A meal replacement is a drink, bar, soup, etc. intended as a substitute for a solid food, usually with controlled quantities of calories and nutrients. Some drinks come in powdered form or pre-mixed Health shake that can be cheaper than solid foods with identical health qualities. Medically prescribed meal replacement drinks include the body's necessary vitamins and minerals. sometimes use meal replacements, not formulated for weight loss, to save food preparation time when eating 5-6 meals a day.
In European Union, weight loss meal replacements intended to either supplement ("Meal replacement for weight control") or totally replace ("Total diet replacement for weight control") normal meals are regulated as to their energy content, the they must provide, and information and advice on packaging by EU Directive 96/8/EC of 26 February 1996 on foods intended for use in energy-restricted diets for weight reduction. For example, a meal replacement must provide the minimum specified amounts of various vitamins and minerals and contain between 200 and 400 of energy, of which no more than 30% can be from fat. Labeling information is prescribed, and packaging must provide a statement that the product should not be used for more than three weeks without medical advice in order to protect users from inadvertent malnutrition.
In the United States, the term "meal replacement" is not defined in federal Food and Drug Administration regulations but generally refers to a calorie-controlled, prepackaged product in the form of a Energy bar or beverage (ready-to-drink or powder), that is meant to replace a higher calorie meal. Meal replacement products are usually fortified with more than 20 vitamins and minerals at "good" or "excellent" source levels. Meal replacement products can be regulated as conventional or . In Canada, meal replacements are regulated by the Canadian Food Inspection Agency and must meet minimum calorie, protein and vitamin requirements, causing some American products to be rejected.
Meal replacements can be used to treat diabetes by maintaining weight loss. According to the American Diabetes Association (ADA), meal replacement products can be used once or twice a day, in lieu of regular meals, to maintain weight loss for individuals with diabetes. However, that weight loss can only be maintained as long as the individual keeps up with the meal replacement plan.
Meal replacements have been combined with GLP-1 receptor agonists to enhance adherence and efficacy.
The effects of meal replacements on weight loss for individuals with mental illness, such as schizophrenia, schizoaffective disorder, bipolar disorder, are inconclusive.
Meal replacements also appear in later space travel stories such as Santa Claus Conquers the Martians (1964) and the television series Lost in Space (1965).
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