“Complementary plant proteins must be combined at every meal.”
You do not need to combine complementary plant proteins at every meal; a variety of plant proteins over the day is enough.
Plant-based eating does not require protein-pairing math at every meal. Eat enough food overall and include a mix of protein-rich plant foods across your day.
Include a few different plant proteins over your day, such as beans, lentils, soy, grains and nuts, without matching them meal by meal.
A detailed review of protein in vegetarian diets found no evidence that plant proteins need to be paired in the same meal, and a major nutrition position paper says a variety of plant foods eaten over the day supplies enough essential amino acids. Both sources agree and nothing supports the meal-by-meal rule, so confidence is strong.
You do not need to combine complementary plant proteins at every meal; a variety of plant proteins over the day is enough. A 2019 review found no evidence that plant proteins must be combined in the same meal and said a reasonable variety of sources over the course of the day is appropriate.
The meal-pairing idea comes from the fact that single plant proteins can be low in one essential amino acid, usually lysine. Pairing foods such as beans and grains in one meal can be a practical way to cover needs when total protein intake is low, but it is not required.
- Mariotti F, Gardner CD. Dietary Protein and Amino Acids in Vegetarian Diets: A Review. Nutrients. 2019;11(11):2661. DOI: 10.3390/nu11112661. PMID: 31690027. PMCID: PMC6893534
- Melina V, Craig W, Levin S. Position of the Academy of Nutrition and Dietetics: Vegetarian Diets. Journal of the Academy of Nutrition and Dietetics. 2016;116(12):1970-1980. DOI: 10.1016/j.jand.2016.09.025. PMID: 27886704