The 'where do you get your protein' question, answered from a dietitians' position paper.
Vegan Brief·Evidence last reviewed July 2, 2026
This is a summary of the cited evidence, not medical advice.
Academy on complete proteinsNot needed per meal
Key ideaVariety across the day
SourceAcademy of Nutrition and Dietetics
01
The amino-acid question, answered
The worry behind the protein question is really about amino acids: can plants supply all the ones the body cannot make? The Academy of Nutrition and Dietetics answers it in one sentence.
Primary source 01 / 03
Protein from a variety of plant foods, eaten during the course of a day, supplies enough of all indispensable (essential) amino acids when caloric requirements are met.
The old rule about carefully combining rice and beans at the same meal is gone. What matters is variety and enough total food. The Academy also puts the popular 'complete protein' language where it belongs.
Primary source 02 / 03
The terms complete and incomplete are misleading in relation to plant protein.
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Vitamin B12 on a vegan dietB12 is the one nutrient where both cited sources speak bluntly about what plant foods do not supply.
Plant-based diets, gout and kidney stonesFor gout and kidney stones, cutting meat is one of the cleaner wins in nutrition. Vegetarians formed about a third fewer stones, and plant purines never earned their bad reputation.
Creatine on a vegan dietYour body makes some creatine, and the only foods that carry the rest are meat and fish. That leaves vegans with lower stores, which may be exactly why they respond so well to the supplement.
Protein combining at every mealThe old rule was that vegans had to pair rice with beans at every meal to make a complete protein. Here is what the Academy of Nutrition and Dietetics says about it.
Vegan diets and athletic performanceA growing list of pro athletes eat plant-based, and the science is not the obstacle it was once assumed to be. The position papers put vegan diets squarely inside the range that works for sport.
Is Casein and caseinate vegan?Is it vegan? · Casein is milk protein, and it turns up in surprising places, including some non-dairy creamers and a few plant-styled cheeses.
Is Whey vegan?Is it vegan? · Whey is the liquid left when milk curdles, dried into powder. It is milk, so it is not vegan, and it hides in more than protein shakes.
Is Collagen vegan?Is it vegan? · Collagen is the scaffolding of animal bodies: skin, bone, connective tissue. There is no plant version, so every real collagen supplement is animal-derived, and vegan collagen is a different thing wearing the same name.
Is Albumin and albumen vegan?Is it vegan? · Albumin is the workhorse protein of egg white, and sometimes of blood plasma. Either way it is an animal binder wearing a lab-coat name.
Is Keratin vegan?Is it vegan? · Keratin is the protein in hair, nails, horns and feathers. The keratin in a smoothing treatment is sourced from exactly those animal parts.
Is Elastin vegan?Is it vegan? · Elastin is the protein that lets skin snap back. In a serum, it is usually harvested from animal connective tissue, the same as its cousin collagen.
Is Glycine (E640) vegan?Is it vegan? · Glycine is the simplest amino acid, sold as a sweetish additive and supplement. The commercial version is synthesised in a factory, not boiled out of an animal.
What vegans actually eat in a dayGuides · Most of what is already on a normal plate, from oatmeal to pasta to peanut butter on toast, is vegan without any substitution at all.
Answering objections to veganism, honestlyGuides · The strongest objections to veganism are real arguments, not excuses, and most of them fail for a specific, findable reason rather than a general one.
Frequently asked
Do vegans need to combine proteins at each meal?
No. The Academy of Nutrition and Dietetics states that protein from a variety of plant foods eaten during the course of a day supplies enough of all indispensable amino acids when caloric requirements are met. Combining foods within a single meal is not required.
Is plant protein 'incomplete'?
The Academy of Nutrition and Dietetics calls the terms complete and incomplete misleading in relation to plant protein. A varied plant diet with adequate calories supplies all essential amino acids.
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