Research
Hormonal
Energy-restricted diets result in modest long-term weight loss (approx. 3% maintained at 5 years) and high relapse rates (>80%) due to compensatory metabolic adaptations including increased hunger hormones (ghrelin), decreased satiety hormones (leptin, GLP-1, PYY), and reduced energy expenditure.
Standard calorie restriction often fails long-term because your body fights back by increasing hunger hormones and lowering metabolism. To succeed, you must manage these biological responses, likely by prioritizing high protein intake to help suppress hunger hormones like ghrelin and preserve metabolic rate, rather than just cutting calories blindly.
GoodQualifiesHIGH confidence
In a meta-analysis of 29 long term trials on weight maintenance, only a 3% weight loss was maintained after a period of 5 years [45]. The extremely high rate of failure to maintain lost weight, estimated to be at more than 80%, is thought to be primarily the result of the metabolic adaptation and compensatory mechanisms that defend body weight and maintain energy stores [41,46].
Why this rating
Based on a meta-analysis of 29 long-term trials and multiple systematic reviews cited in the text.
Source
Dietary Management of Obesity: A Review of the Evidence
Nahla Hwalla et al. · Diagnostics · 2020
DOI 10.3390/diagnostics11010024
narrative_reviewCited 59×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- High protein diets increase satiety and preserve fat-free mass during weight loss through increased anorexigenic hormones (GLP-1, PYY, CCK), decreased orexigenic hormones (ghrelin), and higher diet-induced thermogenesis, though long-term satiety benefits may diminish due to adaptation.Good
- Low carbohydrate diets induce rapid short-term weight loss partly through ketosis (suppressing appetite via ketone bodies) and diuresis (water loss from glycogen depletion), but may increase LDL cholesterol and reduce diet quality due to low fiber intake.Moderate
- Population-wide fiscal measures, such as taxes on sugar-sweetened beverages and unhealthy foods, can reduce purchases of taxed items and prevent childhood obesity cases, though their immediate impact on population health outcomes is limited and requires sustained implementation.Moderate
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