Weight Loss Strategy Evidence Explorer

Weight-loss strategies are often presented as rivals, but in head-to-head trials, diets with different fat, protein and carbohydrate targets have produced similar average weight loss.1,2 This explorer sets out what randomised trials, meta-analyses and my own articles show for common strategies, with my own observations next to some of them.

Check with your doctor before changing your diet or training to lose weight, and before any weight-loss medication. This explorer shows what studies found on average. It cannot tell you which approach, pace or medicine suits you; that depends on your health, your medicines and your sport, and should be assessed by your own doctor.

Evidence at a glance
StrategyWhat the research shows
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Why so many strategies end up similar

In a two-year trial comparing four diets with different fat, protein and carbohydrate targets, satiety, hunger and satisfaction with the diet were similar across all of them.1 Intermittent fasting formats have generally performed similarly to daily calorie restriction, with alternate-day fasting showing a modest average advantage in a network meta-analysis.4

How to read the labels

The labels summarise the studies listed for each strategy. They describe average results in groups of people and do not predict how much weight an individual will lose. “Doctor-prescribed treatment” marks a medicine, not a lifestyle choice.

References

  1. Sacks et al. 2009. Comparison of Weight-Loss Diets with Different Compositions of Fat, Protein, and Carbohydrates. N Engl J Med.
  2. Gardner et al. 2018. Effect of Low-Fat vs Low-Carbohydrate Diet on 12-Month Weight Loss in Overweight Adults and the Association With Genotype Pattern or Insulin Secretion: The DIETFITS Randomized Clinical Trial. JAMA.
  3. Liu et al. 2022. Calorie Restriction with or without Time-Restricted Eating in Weight Loss. N Engl J Med.
  4. Semnani-Azad et al. 2025. Intermittent fasting strategies and their effects on body weight and other cardiometabolic risk factors: systematic review and network meta-analysis of randomised clinical trials. BMJ.
  5. Catenacci et al. 2025. The Effect of 4:3 Intermittent Fasting on Weight Loss at 12 Months. Ann Intern Med.
  6. Blazey et al. 2023. The effects of eating frequency on changes in body composition and cardiometabolic health in adults: a systematic review with meta-analysis of randomized trials. Int J Behav Nutr Phys Act.
  7. Zhang et al. 2025. Objective and subjective appetite measures: high versus low eating frequency in a randomized crossover clinical trial. Obesity.
  8. Wycherley et al. 2012. Effects of energy-restricted high-protein, low-fat compared with standard-protein, low-fat diets: a meta-analysis of randomized controlled trials. Am J Clin Nutr.
  9. Longland et al. 2016. Higher compared with lower dietary protein during an energy deficit combined with intense exercise promotes greater lean mass gain and fat mass loss: a randomized trial. Am J Clin Nutr.
  10. Donnelly et al. 2009. American College of Sports Medicine Position Stand. Appropriate physical activity intervention strategies for weight loss and prevention of weight regain for adults. Med Sci Sports Exerc.
  11. Garthe et al. 2011. Effect of Two Different Weight-Loss Rates on Body Composition and Strength and Power-Related Performance in Elite Athletes. Int J Sport Nutr Exerc Metab.
  12. Wilding et al. 2021. Once-Weekly Semaglutide in Adults with Overweight or Obesity (STEP 1). N Engl J Med.
  13. Dr. Antti Rintanen: Fasting vs Small Frequent Meals for Weight Loss: What the Evidence Actually Shows
  14. Dr. Antti Rintanen: How Much Muscle Do You Lose When Losing Weight?
  15. Dr. Antti Rintanen: Leptin in Athletes
  16. Dr. Antti Rintanen: Fasting for Athletes

This tool is for general education. It does not diagnose, give personal recommendations or replace an assessment by your doctor.