Blood flow is the river of life. Better blood flow means better b_ners, better brain, better energy, better healing.Popular diets are compared. Book explains benefits of vegan diet. Physiology, evolutionary biology, and epidemiology of blood flow are explained.Book explains how to improve blood flow. Potassium and arugula improve blood flow because they increase nitric oxide.Sodium decreases blood flow because it lowers nitric oxide. Fructose decreases blood flow because it increases uric acid which then lowers nitric oxide.Elevated LDL cholesterol decreases blood flow, because it overcomes the zeta potential of RBC's, causing rouleaux. Rouleaux increases blood viscosity. Increased blood viscosity causes hypertension. Hypertension causes atherosclerosis.