3RW editorial team
Three Reasons Why is a research-backed guide to veganism, written for people who want to check the claims rather than be encouraged. Every factual statement on this site is sourced to peer-reviewed research or primary documentation, and arguments are presented alongside their strongest counterarguments. The editorial team researches, writes and fact-checks all articles.
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.
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.
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.
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.
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.
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.