This book will change the way you think about bone density and osteoporosis. The weakening of bones is often viewed as a calcium defi ciency, when actually it’s an imbalance between calcium intake and excretion. As nutrition professor Amy Joy Lanou, ., and noted medical journalist Michael Castleman eloquently reveal, diets rich in animal protein, including meat and dairy, add acid to the blood. This acid accelerates osteoporosis by depleting bones of calcium, phosphorus, and sodium.