Fiber Fueled by Will Bulsiewicz — book cover

Fiber Fueled

Will Bulsiewicz · 2020

Fiber Fueled (2020) is a book by Will Bulsiewicz on health & the body. Gastroenterologist Will Bulsiewicz argues your gut microbiome is the master switch for health, and that fiber diversity, not any diet tribe, is what feeds it. Eat 30+ plants a week and your microbes reward you with anti-inflammatory postbiotics.

11 min read · 8 chapters · Health

Why it’s on the shelf

A gastroenterologist makes the radical case that the single most powerful health lever isn't protein, fat, or calories, it's how many different plants you eat.

Two of the ideas you’ll keep

The Clif summary of Fiber Fueled pulls out 7 insights. Here are the first two.

  1. Fiber isn't inert **roughage** that just 'keeps you regular', it's the preferred food of your gut bacteria. Bulsiewicz's core reframe is to stop asking what fiber does to you and start asking what your **microbes** do with it.
  2. When gut bacteria ferment fiber, they produce **short-chain fatty acids (SCFAs)** like **butyrate**, 'postbiotics' that feed your colon cells, seal the gut barrier, calm inflammation, and even signal the brain. Fiber's real magic is this microbial byproduct.

The other 5 — and the full 11-minute summary — are in the app.

What’s inside: 8 chapters

The whole summary runs about 11 minutes, read or listened to.

  1. The Doctor Who Was His Own Worst Patient
  2. Meet the Ecosystem Inside You
  3. Fiber Is Fertilizer, Not Roughage
  4. Diversity Beats the Diet Tribes
  5. How the Western Diet Poisons the Well
  6. It's Not Gluten: It's Your Untrained Gut
  7. F GOALS: The Fiber-Fueled Food Groups
  8. The Four-Week Reboot and the Honest Caveats

Finish Fiber Fueled tonight.

Read or listen to the full summary in about 11 minutes, then keep the ideas with a minute of review a day. Start with the 2-minute quiz — no card required.

Start free — 2 minutes See pricing

All 39 Health summaries →