Mother’s milk is for babies, cow’s milk is for baby cows, soybeans are for grazing animals with four stomachs…
I recommend brazil nuts and fruit because the combination of these contain favorable amounts of methionine and cystine, amino acids which are deficient and therefore limiting in most other foods. They are also easily packable, vegan, calorie-dense, and contain micronutrients. And it’s silly to talk about eating “only almonds/oats/quinoa/etc all day” because you aren’t doing that, and protein in even small quantities like fruit and nuts is not negligible, especially if it’s of high quality. If you’re interested, the Free Acne Book(ignoring the name) contains a detailed study of amino acids. The surrounding “Wai” sites also have lots of (referenced) info about diet and protein.

