Vlcd

Meal replacement shakes have genuine clinical evidence for weight loss when used as structured replacements for one or two meals per day. This article examines the RCT evidence, distinguishes effective from ineffective products, and explains what the research shows about which ingredients and formulations are clinically relevant.

NICE recommends 0.5–1kg/week as the target rate for sustainable weight loss. Faster rates increase risks including lean mass loss, gallstone formation, and metabolic adaptation. This article reviews the evidence on safe rates, physiological consequences of excess speed, and clinical circumstances where faster loss is medically supervised.

Weight loss shakes fall into distinct regulatory and nutritional categories with different evidence bases, appropriate use cases, and nutritional completeness standards. This guide compares meal replacement shakes, protein supplements, and VLCD products across evidence, labelling, and selection criteria.

Fast and slow weight loss produce the same total fat loss given equivalent calorie deficits — but at different rates. The tradeoffs involve lean mass preservation, metabolic adaptation, gallstone risk, and long-term sustainability. This article reviews the evidence on each.

Meal replacement shakes have strong evidence for short-term weight loss: Heymsfield et al. (2003, Cochrane-level meta-analysis) found meal replacements produced 2.54 kg more weight loss at 3 months than conventional diets. NHS Very Low Calorie Diet programmes (800 kcal/day total meal replacements) produce ~10–15 kg in 12 weeks. The key variable is calorie content and protein adequacy — not brand-specific ingredients. This article covers types, evidence, and what to look for.