Soybeans are the only plant proteins that contain all 8 essential amino acids, meaning they are “complete” proteins like egg whites or chicken. A slice of firm tofu (2.86 ounces) contains 13 grams of protein, 2 grams of fiber, 0.5 grams of omega-3 fatty acids, 55% of the Recommended Dietary Intake (RDI) for calcium (when made with calcium sulfate), 12% RDI for iron and magnesium, 20% of the RDI for selenium, 9% for vitamin B1, and 6% for folic acid.
