Nope-white rice has a mere 9% protein per serving-and it is nearly 89% carbs-all starch, and less than 10% of any useful nutrients. A serving of pinto beans has 45 gms, of plant based carbs-no starch-and 15 gms of protein, plus thiamine and several other useful nutrients. White rice does not add any useful nutrition to beans-just carbs. That is from the handout the local gym has on the front desk...
I have to disagree. White rice has fewer nutrients in general than whole (brown) rice, but when added to a diet containing beans, lentils, etc., it provides complete protein. In fact, research has shown that one doesn’t even need to eat them at the same meal, to acquire all of the amino acids in one’s diet.
(Another great plant source that does provide complete protein in itself, is the amaranth Quinoa. Some US farmers began growing this decades ago. You can make a really good Tabbouli from Quinoa.)
https://www.healthline.com/nutrition/ways-to-use-white-rice#9-ways-to-use
https://nutritionfacts.org/blog/do-you-have-to-combine-plant-proteins-at-a-meal/
https://vegfaqs.com/quinoa-amino-acid-profile/
Adding bread to a meal of beans makes a complete protein, with whole grain breads supplying the most. Cornbread, oats whole wheat breads, etc. White bread will do, but it is low in the amino acid that is missing from beans. Somehow, American Indians figured this out with “the 3 Sisters” -— corn, beans and squash.