Straight answers about veganism, with the sources.
Every claim is cited. Where the evidence is mixed, we say so.
What brings you here?
- Someone told me something and I want to check itCommon claims, examined one by one
- I'm thinking about eating vegan and want to know if it's safeNutrients, supplements, health outcomes
- I want to know what it does for the climate and land useEmissions, deforestation, trade-offs
- Do animals really feel pain?What the research says about animal minds
- Just show me the studiesEvery source we cite, in one list
Most-asked questions
All questions- Do vegans need B12 supplements?Yes. B12 is essential and must be supplemented or obtained from fortified foods on a vegan diet. This is not a flaw of veganism—B12 comes from bacteria, and modern food systems remove it from most sources.
- Where do vegans get protein?Vegans get protein from legumes (beans, lentils, chickpeas), soy products (tofu, tempeh, edamame), seitan, nuts, seeds, and whole grains. A varied vegan diet easily meets protein needs without special planning.
- Vegans are nutritionally deficientWell-planned vegan diets are nutritionally adequate for all life stages according to major dietetic associations. Some nutrients require attention (B12, vitamin D, omega-3s), but deficiencies are not inevitable.
- Can I get enough iron on a vegan diet?Yes. Plant sources of iron include legumes, tofu, tempeh, fortified cereals, and leafy greens. Pairing iron-rich foods with vitamin C significantly enhances absorption.
- Did Humans Evolve to Eat Meat?Early humans did eat meat, and the archaeological evidence for that is solid. Whether meat drove brain evolution is a different and unresolved question: the leading hypothesis points to higher-quality, energy-dense food in general, and cooked starches, fruit and honey are as plausible as meat. However, evolutionary capacity is not the same as modern necessity. Humans are anatomical omnivores with specific adaptations for both plant and animal foods, and every major dietetic organization confirms that well-planned vegan diets are nutritionally adequate for adults.
- “Plant-based diets reduce emissions”Dietary shifts toward plant-forward patterns are repeatedly identified as major levers to reduce food-system emissions, land use, and other impacts. Effects are largest when replacing ruminant meat and dairy.
- Do animals feel pain?Yes. The scientific consensus, formalized in the Cambridge Declaration on Consciousness (2012) and reinforced by the New York Declaration on Animal Consciousness (2024), is that mammals, birds, and many other animals possess the neurological substrates necessary for conscious experience, including the capacity to feel pain.
- What about omega-3 fatty acids on a vegan diet?ALA omega-3 comes from flax, chia, walnuts, and hemp seeds. For optimal DHA/EPA intake, algae-based supplements are recommended since these are the forms your brain and body use directly.
- Microplastics (with cautious framing)Microplastics are pervasive in air, water, and many foods; exposure is not solved by any single diet. However, bioaccumulation can occur across trophic levels (especially in aquatic systems), and some animal products (e.g., seafood) are notable exposure pathways. Evidence is evolving; avoid overclaiming “plants have none.”
- Bioaccumulation: toxins and POPsMany persistent organic pollutants (e.g., dioxins, dioxin-like PCBs) are lipophilic and bioaccumulate up the food chain, concentrating in animal fats. Health agencies note most human exposure is through animal-derived foods, and trimming fat/choosing low-fat dairy can reduce exposure.
424 sources87 answersUpdated Oct 8, 2026