How the nutrition communities compare
A few giants dominate — r/nutrition, r/keto and r/PlantBasedDiet together account for 97% of the combined membership. Size and activity don't line up perfectly: r/nutrition has the most members, but r/diet gets the most new posts (about 20 a day, against 9 in r/nutrition). Among the communities we track weekly, r/keto grew fastest recently (+0.01%, +417 members since Oct 26). The oldest is r/nutrition, founded in 2008, and every community here is more than five years old — this is a long-established corner of Reddit.
The 7 biggest nutrition subreddits
r/nutrition 5,914,546 members · ~9.1 posts/day · +576 since Oct 26 · since 2008A subreddit for the discussion of nutrition science. Macronutrients, micronutrients, vitamins, diets, and nutrition news are among the many topics discussed. Civil discourse is required.
r/keto 3,960,598 members · ~12 posts/day · +417 since Oct 26 · since 2010The Ketogenic Diet is a low carbohydrate method of eating. /r/keto is place to share thoughts, ideas, benefits, and experiences around eating within a Ketogenic lifestyle. Helping people with diabetes, epilepsy, autoimmune disord…
- Pr/PlantBasedDiet ↗ 496,757 members · ~7.6 posts/day · since 2012
Home for all Plant-Based eaters!
- Mr/mediterraneandiet ↗ 149,330 members · since 2013
The Mediterranean Diet is based on the traditional foods that people used to eat in countries such as Italy and Greece. r/mediterraneandiet is a place to learn about the Mediterranean way of eating as well as share pictures, reci…
- Cr/carnivorediet ↗ 76,002 members · ~17 posts/day · since 2018
This group is for sharing Carnivore Diet success stories and providing positive news and information regarding Carnivory. However, you define your Carnivore Diet is fine by me. That said this is not a Keto group. This is a meat-b…
- Sr/ScientificNutrition ↗ 53,815 members · ~5.6 posts/day · since 2018
Welcome to r/ScientificNutrition! This subreddit has been created to serve as a neutral ground for exchanging and discussing scientific evidence relating to human nutrition. Importantly, this sub is not for people to request or p…
- Dr/diet ↗ 47,376 members · ~20 posts/day · since 2008
Welcome to /r/Diet: a place to discuss diets and nutrition. Join us on Discord! https://discord.gg/diet
Choosing where to post
Competition for attention differs a lot: r/nutrition has 5.9M members but only about 9.1 new posts a day — roughly one new post for every 650K members — while r/diet gets about 20 a day, one for every 2.4K. A strong, well-made post therefore has more room to be seen in r/nutrition; r/diet is better when you want quick replies.
Big subreddits give a post the widest audience, but they also bury it quickly; the mid-sized communities on this list are usually friendlier for questions and first posts. Always read the rules in the sidebar first — each community is run by its own volunteer moderators. Our guide to searching Reddit explains how to dig through any of these communities, and the subreddit info tool gives you the stats of one we don't list.
Frequently asked questions
Which nutrition subreddit has the most members?
r/nutrition is the largest, with 5,914,546 members, followed by r/keto (4M) and r/PlantBasedDiet (496.8K).
Where are the most new nutrition posts?
By new posts per day, r/diet leads with about 20, ahead of r/carnivorediet (17). Counts are averages over the last seven days.
How many nutrition communities are on this list?
We list 7 active, safe-for-work nutrition communities with at least 25,000 members each, 10.7M members in total (people can be in several). Reddit has many smaller ones too; our guide on searching Reddit shows how to find them.
What is the oldest nutrition subreddit?
r/diet, created on Aug 23, 2008.
Are these nutrition subreddits safe for work?
Yes. Every community on this page is public and not marked 18+ by Reddit, and we filter out communities whose name or description points to adult content.
Data: Reddit's public subreddit search and the Arctic Shift archive (Nov 6, 2026), growth from SubMouse's weekly snapshots. Member counts of communities outside our Top 1000 come from the archive and can lag a little. Not affiliated with Reddit.