1Teeth: built to process variety
Human teeth do many jobs — cut, tear, crush, and grind.
- IncisorsCut
- CaninesTear
- PremolarsCrush
- MolarsGrind
Our mouths are built for a varied, mixed diet with real chewing power.
Human Biology Loves Plants
Not because humans are one simple category, but because fiber, microbes, teeth, and amino acids all tell a richer story.
Human BiologyGut MicrobiomeProtein BasicsNot Medical Advice
2Fiber: the plant-only signal
Fiber is found in plants — your body can't fully digest it, but your gut microbes thrive on it.
- Beans & lentils
- Oats & whole grains
- Berries & fruit
- Greens & veg
Happy gut microbes
Your microbes ferment what you can't, and make compounds that support you.
3Protein: amino acids, not meat magic
Protein is made of amino acids — and plants contain amino acids.
- Sunlight
- Plants
- Amino acids
- Human body
A varied plant-based diet with enough calories can supply the amino acids you need.
4Milk: infant food, adult adaptation
Human milk is made for human infants. After infancy, lactase persistence (the ability to digest lactose) varies widely by population — roughly 65% of people worldwide have reduced lactase after infancy.
Human milkPerfect for infants
Lactase genePersistence varies
Worldwide variation~65% have reduced lactase after infancy
Enjoy or avoid dairy based on your body and your values.
Comparative biology only — this is not infant-feeding advice.
Go deeper
A closer look
Human biology
The Fiber Gap
Everyone asks about protein — most people are missing fiber. The gap, the plant sources, and the gut-microbe journey, visually.
Read the page →Human biologyTMAO, Explained
The gut-microbe compound, red meat, and the heart-health question — with the honest caveats, including the seafood paradox.
Read the page →Comparative biologyBuilt on Leaves
How the largest primate builds enormous strength on a mostly-plant diet — and why that breaks the “meat equals strength” myth.
Read the page →Sources & citations (6)Tap to open
- Teeth: Anatomy, Types, Function & Care
- Fiber (The Nutrition Source)
- Fiber (MedlinePlus Medical Encyclopedia)Recommends 21–38 g of fiber per day for older children, adolescents, and adults; notes Americans average about 16 g/day; advises adding fiber gradually over a few weeks and drinking plenty of fluids.
- Protein in diet (MedlinePlus Medical Encyclopedia)
- Amino acids (MedlinePlus Medical Encyclopedia)
- Lactose intolerance (MedlinePlus Genetics)
We summarize these sources in our own words and link to the originals. Summaries can simplify nuanced findings — follow the links for the full picture.