Three Reasons Why
9 articles

Everything we have published

Newest first. Every claim links to the study behind it.

A glucose meter surrounded by scattered almonds and peanuts on a white background.
[ Health ][ Nutrition ]

A vegan diet won't cure diabetes. It might replace half your pills.

A whole-food plant-based diet drops A1c by about 0.4 points on average, roughly half the effect of metformin. What the trials actually show, why it only works when it's whole foods and not vegan junk food, and the medication catch diabetics need to plan for before switching.

UPD 2026-09-04 · 12 MIN
An overhead view of dried brown lentils in a ceramic bowl.
[ Nutrition ][ Health ]

Your vegan diet has enough iron. Your coffee habit might be stealing it.

Non-heme iron from plants absorbs at 5-12%, against 14-18% for the heme iron in meat - which is why vegans need about 1.8 times the RDA. What closes the gap: pairing with vitamin C, keeping tea and coffee away from iron-focused meals, and where the iron actually is.

UPD 2026-09-02 · 12 MIN
Black and white cattle grazing in a sunlit green pasture surrounded by trees.
[ Environment ][ Ethics ]

Can regenerative farming feed the world? It would take five Earths

Regenerative grazing beats a feedlot and does not scale to current diets. The land arithmetic, what controlled comparisons say about rotation, and how much soil carbon actually offsets.

UPD 2026-08-28 · 24 MIN
Interior of an indoor pig farming facility, rows of pens running the length of the barn
[ Ethics ][ Environment ][ Health ]

Why would someone be vegan? The most common reason is the weakest one

Health is the reason people name most often, and it is the weakest of the three. What the prospective data says about why people switch, and what each argument is worth.

UPD 2026-08-27 · 16 MIN
Loose fresh spinach leaves with pink-red stems, piled together
[ Nutrition ][ Health ]

Where do vegans get calcium? Spinach is the trap

A cup of cooked spinach carries more calcium than a cup of milk and delivers almost none of it. Plant calcium sources ranked by absorption, and a day of eating that clears the RDA.

UPD 2026-08-25 · 12 MIN
Scrabble tiles spelling VEGAN scattered on a rustic brown surface
[ Health ][ Nutrition ][ Environment ]

The cons of a vegan diet

Every version of this question treats planning as a defect of plant-based eating. Animal foods are planned too, at the feed mill, by someone else. What the evidence shows, and the five rules that settle it.

UPD 2026-08-25 · 41 MIN
A pale shoe with a crocodile-embossed finish, carrying a paper swing tag that reads Vegan
[ Food & Products ][ Environment ]

What is vegan leather made of? Mostly plastic, and still the better buy

The label tells you no animal died. It tells you nothing about what the material is, and the answer is usually plastic, including in the plant-based options.

UPD 2026-08-25 · 25 MIN
Hands tipping white capsules from an amber supplement bottle into an open palm
[ Nutrition ][ Health ]

What supplements do vegans need? B12, and then it depends

The honest shortlist is shorter than most vegan supplement guides suggest. One nutrient is non-negotiable, three need attention for specific reasons, and the rest depend on what is already on the plate.

UPD 2026-08-25 · 15 MIN
Gandhi seated among members of the London Vegetarian Society at a gathering in November 1931
[ Vegan Basics ][ Ethics ]

When did veganism start? The word is 1944. The argument is much older.

The word is eighty years old. The argument behind it is more than two hundred. A precise account of when veganism started, and why the answer depends entirely on what is being asked.

UPD 2026-08-21 · 17 MIN