Weight Loss Evidence

Evidence map

Diet comparison: what the evidence base looks like

11 publications, 6 of them trials and 5 syntheses. This page describes the shape of that literature rather than summarising its conclusions.

Updated 4 min read 11 citations

What the evidence on diet comparison is made of Of 11 publications on this topic, the breakdown by study type: 5 meta-analysis, 6 randomised trial. 56meta-analysis (5)randomised trial (6)
11 publications, by study type. Volume is not strength — the same count can be a settled question or a pile of commentary, and which one it is depends almost entirely on this breakdown. Harvested from PubMed and Crossref; publication type as recorded by the source.

What this literature is made of

This is a well-developed evidence base: multiple syntheses sitting on a substantial body of trials. Questions here are usually about applicability rather than about whether an effect exists.

The distinction that matters most is between synthesis and primary research. A meta-analysis pools trials and is the closest thing to a settled answer a field produces. A narrative review is one group's reading of the same material and can be selective without being dishonest. Counting them together, which most citation counts do, obscures exactly the thing you want to know.

When the diet comparison literature was published Publication years for the 11 papers on this topic, grouped into bands from before 2015 through to 2023 onwards. 2020-20224 papers2023 onwards3 papersBefore 20153 papers2015-20191 papers
Still active. The most recent paper here is from 2024, so this is a field where an answer written today may not hold for long. Publication years as recorded by PubMed and Crossref.

How this page is built

Everything above is computed from the citations this site harvested from PubMed and Crossref, not written by hand. When the weekly harvest finds a new paper on this topic, these counts change and the characterisation changes with them. That is the point: a hand-written claim about how strong an evidence base is starts decaying the day it is written.

Publication type is taken as the source records it. That is imperfect — journals label inconsistently, and a paper indexed as a "review" may be a systematic one — so treat the bands as approximate. They are accurate enough to distinguish a trial literature from a commentary literature, which is the distinction that matters.

The strongest work on this topic

Ordered by study design first, then recency. The full set is listed in the references below.

  1. Comparison of weight loss effects among overweight/obese adults: A network meta-analysis of mediterranean, low carbohydrate, and low-fat diets — Akbari M, Vali M, Rezaei S et al., 2024, meta-analysis
  2. Ketogenic Diet Benefits to Weight Loss, Glycemic Control, and Lipid Profiles in Overweight Patients with Type 2 Diabetes Mellitus: A Meta-Analysis of Randomized Controlled Trails — Zhou C, Wang M, Liang J et al., 2022, meta-analysis
  3. Diets for weight management in adults with type 2 diabetes: an umbrella review of published meta-analyses and systematic review of trials of diets for diabetes remission — Churuangsuk C, Hall J, Reynolds A et al., 2022, systematic review
  4. Comparison of dietary macronutrient patterns of 14 popular named dietary programmes for weight and cardiovascular risk factor reduction in adults: systematic review and network meta-analysis of randomised trials — Ge L, Sadeghirad B, Ball GDC et al., 2020, meta-analysis
  5. The Effect of Low-Fat and Low-Carbohydrate Diets on Weight Loss and Lipid Levels: A Systematic Review and Meta-Analysis — Chawla S, Tessarolo Silva F, Amaral Medeiros S et al., 2020, meta-analysis
  6. Effects of healthy low-carbohydrate diet and time-restricted eating on weight and gut microbiome in adults with overweight or obesity: Feeding RCT — Li L, Li R, Tian Q et al., 2024, randomised controlled trial
  7. Effect of Calorie-Unrestricted Low-Carbohydrate, High-Fat Diet Versus High-Carbohydrate, Low-Fat Diet on Type 2 Diabetes and Nonalcoholic Fatty Liver Disease : A Randomized Controlled Trial — Hansen CD, Gram-Kampmann EM, Hansen JK et al., 2023, randomised controlled trial
  8. 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 — Gardner CD, Trepanowski JF, Del Gobbo LC et al., 2018, randomised controlled trial
  9. Effects of low-carbohydrate and low-fat diets: a randomized trial — Bazzano LA, Hu T, Reynolds K et al., 2014, randomised controlled trial
  10. Comparison of weight-loss diets with different compositions of fat, protein, and carbohydrates — Sacks FM, Bray GA, Carey VJ et al., 2009, randomised controlled trial
How much research is there on diet comparison?
11 publications are indexed here, of which 6 are trials and 5 are syntheses.
Does more research mean a stronger conclusion?
No. Composition matters more than volume — five randomised trials support a claim far better than fifty commentaries, and citation counts do not distinguish between them.
How current is this?
The most recent paper indexed here is from 2024. The set is refreshed weekly from PubMed and Crossref.
Why does this page not tell me the answer?
Because summarising a literature into a conclusion requires reading it, and doing that automatically is how confident nonsense gets published. This page tells you how much weight a conclusion could bear; the articles on this site do the interpreting.

References

Every citation below links to the original peer-reviewed record on PubMed or via DOI. Nothing here is a substitute for medical advice.

  1. Comparison of weight loss effects among overweight/obese adults: A network meta-analysis of mediterranean, low carbohydrate, and low-fat diets Akbari M, Vali M, Rezaei S, et al. · Clinical nutrition ESPEN · 2024 · Meta-analysis DOIPubMed 39255914
  2. Diets for weight management in adults with type 2 diabetes: an umbrella review of published meta-analyses and systematic review of trials of diets for diabetes remission Churuangsuk C, Hall J, Reynolds A, et al. · Diabetologia · 2022 · Systematic review DOIPubMed 34796367Full text
  3. Ketogenic Diet Benefits to Weight Loss, Glycemic Control, and Lipid Profiles in Overweight Patients with Type 2 Diabetes Mellitus: A Meta-Analysis of Randomized Controlled Trails Zhou C, Wang M, Liang J, et al. · International journal of environmental research and public health · 2022 · Meta-analysis DOIPubMed 36012064Full text
  4. Comparison of dietary macronutrient patterns of 14 popular named dietary programmes for weight and cardiovascular risk factor reduction in adults: systematic review and network meta-analysis of randomised trials Ge L, Sadeghirad B, Ball GDC, et al. · BMJ (Clinical research ed.) · 2020 · Meta-analysis DOIPubMed 32238384Full text
  5. The Effect of Low-Fat and Low-Carbohydrate Diets on Weight Loss and Lipid Levels: A Systematic Review and Meta-Analysis Chawla S, Tessarolo Silva F, Amaral Medeiros S, et al. · Nutrients · 2020 · Meta-analysis DOIPubMed 33317019Full text
  6. Effects of healthy low-carbohydrate diet and time-restricted eating on weight and gut microbiome in adults with overweight or obesity: Feeding RCT Li L, Li R, Tian Q, et al. · Cell reports. Medicine · 2024 · Randomised controlled trial DOIPubMed 39454570Full text
  7. Effect of Calorie-Unrestricted Low-Carbohydrate, High-Fat Diet Versus High-Carbohydrate, Low-Fat Diet on Type 2 Diabetes and Nonalcoholic Fatty Liver Disease : A Randomized Controlled Trial Hansen CD, Gram-Kampmann EM, Hansen JK, et al. · Annals of internal medicine · 2023 · Randomised controlled trial DOIPubMed 36508737
  8. 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 Gardner CD, Trepanowski JF, Del Gobbo LC, et al. · JAMA · 2018 · Randomised controlled trial DOIPubMed 29466592Full text
  9. Effects of low-carbohydrate and low-fat diets: a randomized trial Bazzano LA, Hu T, Reynolds K, et al. · Annals of internal medicine · 2014 · Randomised controlled trial DOIPubMed 25178568Full text
  10. Comparison of weight-loss diets with different compositions of fat, protein, and carbohydrates Sacks FM, Bray GA, Carey VJ, et al. · The New England journal of medicine · 2009 · Randomised controlled trial DOIPubMed 19246357Full text
  11. Weight loss with a low-carbohydrate, Mediterranean, or low-fat diet Shai I, Schwarzfuchs D, Henkin Y, et al. · The New England journal of medicine · 2008 · Randomised controlled trial DOIPubMed 18635428