Weight and Metabolism Research and Evidence

Overview

This page shows how much research has been published on weight and metabolism topics and explains how to judge the quality of a study. It also lists the main reviews and trials behind this goal. Counts show how much has been published. They do not show whether a treatment works.

PubMed snapshot (retrieved 2026-10-22)

PubMed is the US National Library of Medicine's index of biomedical articles. The counts below come from the NCBI E-utilities esearch tool (database pubmed, count only) on 2026-10-22. Each row shows the exact query text. [1]

Obesity407,606

Weight loss137,807

Randomized trials on weight loss9,202

GLP-1 medicines1,441

Intermittent fasting1,058

Mediterranean diet1,757

Eating disorders18,435

Prediabetes14,995

Weight stigma1,379

Resistance training and weight loss469

Green tea and weight loss208

Apple cider vinegar and weight26

What the counts mean (and do not)

A high count means many articles mention a topic, including laboratory studies, opinion pieces and case reports. A low count can mean a new or niche topic. A topic with few records, such as apple cider vinegar, has little human evidence either way. Counts depend on the exact words used in the query and change daily, so they are a snapshot of volume only.

How to judge a study on weight or metabolism

1. Who was studied? Results in adults with obesity may not apply to people without it, to teens, or to older adults. For example, the sleep-extension trial studied 80 adults aged 21 to 40. [2]
2. Randomized or observational? Randomized trials can show cause; observational studies show links. The food-environment meta-analysis found associations only. [3]
3. How long? Many weight trials last 12 weeks to a year. A network analysis of 121 trials found that weight loss largely faded by 12 months. [4]
4. What was measured? Weight, waist, body fat, lean mass and health outcomes are different. A BMI or scale change does not show what happened to muscle or health. [5]
5. Was the result clinically meaningful? A "statistically significant" difference can be tiny. The herbal medicines review separated differences of 2.5 kg or more as clinically significant. [6]
6. Who paid and who wrote it? Check disclosures. Industry funding does not make a study wrong, but it is worth knowing.
7. Is it one study or a pattern? Systematic reviews and Cochrane reviews combine many studies; they give a clearer picture than one trial.

Main sources behind this goal

Where evidence is thin

Within this section, topics where I looked and found limited evidence include: methods to break a weight plateau, cravings supplements, detox teas for weight loss, and long-term outcomes beyond 12 months for most eating patterns. See the pages on Why weight changes, Appetite, hunger and cravings and Weight-loss supplements, fat burners, detox teas and vinegar.

Explore more

Browse the site's Research Library and Research and safety sources. The goal overview is at Healthy Weight and Metabolism.