Whole grains are a kind of coarse grains, which can support the five internal organs. As early as ancient times, there was a saying that "one grain supplements one dirty". Whole grains can have different effects through professional collocation, and it is no problem for candidates to replenish their brains. Candidates recommend walnut and lotus seed powder for brain strengthening, including black sesame, walnut, almond, peanut, brown rice, oat, lotus seed and other coarse grains.