Plant Diversity Ladder
Increase weekly plant variety in realistic, sustainable steps
- Difficulty
- Easy
- Time to result
- ~weeks to results
- Steps
- 4
- Confidence
- 94%
Use the number of different plants eaten each week as a simple diversity measure. Bulsiewicz cites 30 plants per week from the American Gut Project, while stressing that the number is a spectrum rather than a cliff: 29 is not bad and 30 is not suddenly perfect. Establish the current baseline, then choose a realistic increase. His example is moving from 10 plants to 15 rather than jumping directly to 30. Count broadly across fruits, vegetables, whole grains, seeds, nuts, and legumes. The proposed mechanism is that distinct plants contain distinct forms of fiber and therefore feed different microbial families. The practical aim is sustained dietary variety, not restriction or instant perfection.
Origin
Bulsiewicz connects the American Gut Project's 30-plants finding with his clinical preference for meeting people at their current baseline and increasing variety gradually.
Core principles
- 01Different plants feed different microbial families
- 02Thirty plants is a directional target, not a pass-fail threshold
- 03Sustainable progress beats an abrupt leap
- 04Start with foods you already enjoy
How to run it
- 1
Measure your baseline
Record each distinct plant eaten during a normal week. Include fruits, vegetables, whole grains, seeds, nuts, and legumes.
Pro tip Count variety rather than portions.
Watch out Do not treat 30 as a medical threshold or a pass-fail test.
- 2
Choose a realistic rung
Set the next target modestly above the baseline. Bulsiewicz gives 10 to 15 plants as an example of a manageable first step.
Pro tip Build around foods you already like.
Watch out An abrupt jump may be hard to sustain.
- 3
Add across categories
Introduce new choices from several plant groups instead of relying only on vegetables. Each choice adds another potential source of fiber for the gut microbes.
Pro tip Use seeds, nuts, legumes, and whole grains to make variety easier.
- 4
Stabilize before climbing
Repeat the broader mix until it feels normal, then raise the target again. Treat each durable increase as progress.
Pro tip Celebrate the achieved rung before setting the next one.
In the wild
A person counts 10 regular plants. Rather than attempting 30 immediately, they add lentils, walnuts, berries, oats, and flax across familiar meals, bringing the next week to 15.
→ The person expands variety through a manageable change that can be repeated.
Common mistakes
Treating 30 as a cliff
The cited number is not a boundary where 29 is poor and 30 is perfect; Bulsiewicz describes diversity as a spectrum.
Jumping too far too fast
A large immediate increase can be difficult and therefore less sustainable.
Is it for you?
Best for
People who eat a narrow range of plants and want a gradual way to diversify their diet.
Not ideal for
People who need an individualized therapeutic diet or have symptoms that require clinical assessment.
From the transcript
“30 different plants per week.”
“I would go from 10 to 15. And when you hit 15, I would be celebrating.”
From the episode
The Poo Scientist: "If Your Poo Looks Like This Go To A Doctor!", "Your Gut Health Causes Belly Fat, Anxiety!" & "Alcohol Is Destroying Your Gut Microbiome!"