About

Diet on Trial reviews popular diets, nutrients and supplements against the published research. Each guide starts from the studies: who took part, how long they were followed, what the diet or supplement was compared with and what was measured. Every claim links to the paper or official source it came from.

Who writes the guides

The guides are written and checked by a small editorial team. We are not a clinic, and nothing on the site is a diagnosis or a treatment plan. If you take medication or have a health condition, the right person to ask about a change in diet or supplements is your own doctor or pharmacist.

About this domain

From 2014 to 2020 this address hosted Dietitian on a Diet, a personal blog by a different author. That blog closed, and Diet on Trial began in 2026 under new ownership. None of the earlier posts were written by the current team, and the current guides are not written by or attributed to the earlier author. Where an old address now leads to a new guide on the same subject, the guide was written from scratch.

Korean edition

Selected guides are published in Korean under /ko/. They use the same sources as the English guides and add information about products sold in Korea.

Browse the site

Diet reviews compare eating patterns. Nutrients covers daily intake and food sources. Food features looks at individual foods, and supplements covers studies of ingredients such as lutein and NMN.

Search all articles or read how we write. Image sources are listed in photo credits.