29. Protein is present in all body 31. Carbohydrates and proteins supply calories per gram. 32. In 1747, Dr. James , a physician in the British navy, showed that oranges and lemons could cure scurvy, a vitamin C. deficiency disease. 34. Foods vary widely in their value (measured in calories per gram). 37. Water accounts for percent of body weight. 38. The Daily Food Guide may be used as a basis for dietary 40. Eating right is up to 41. Synthetic vitamins are products.​