SlimFast

SlimFast is a brand of meal replacement products designed for weight management. The product line includes shakes, ready-to-drink beverages, smoothies, meal bars, powders, and other snack items intended to provide portion-controlled options within a calorie-reduced plan. The program marketed under the SlimFast name typically involves substituting two meals per day with SlimFast meal replacements and consuming a single balanced meal and snacks as needed to reach a daily calorie target. Availability is global and products are sold in supermarkets, online retailers, and dedicated websites.

Product formulations vary by region and product type, but they are generally designed to provide a controlled amount of calories while delivering protein, essential vitamins and minerals, and fiber. Some products feature added probiotics or other functional ingredients; sugar content and dietary fat vary by item.

SlimFast originated in the United States in the late 1970s and has since changed hands among several nutrition companies; as of the 2020s, SlimFast products are marketed by different companies in various markets.

Like other calorie-restricted diet plans, results vary by individual and depend on adherence and overall lifestyle. Meal replacements can support short-term weight loss for some users, but long-term maintenance requires sustained healthy eating habits and physical activity. The program is not recommended for children, pregnant or nursing people, or individuals with certain medical conditions without medical advice. Individuals should consult a healthcare professional before starting any weight-loss program.