Mild concussions usually do not show organic damage on a head CT; they are temporary functional dysfunctions of brain neural functions, typically manifesting as brief post-injury consciousness disturbances and retrograde amnesia. The diet for patients with mild concussions should avoid cold, raw, or strongly irritating foods, such as spicy dishes, and refrain from drinking alcohol or smoking. Their diet should primarily consist of light, easy-to-digest foods, high in protein and vitamins, but low in fat and sugar, including plenty of fresh vegetables and fruits.