I'm not a science student. So, please keep your reply simple and straightforward. Thank you. Human body needs water, carbohydrates, proteins, fats, and vitamins in order to function properly and survive. Please correct me if I'm wrong. I once read that apart from some essential amino acids, essential fatty acids, water and vitamins, a human body can almost make anything such as proteins and fats etc from simple sugars like glucose. But is the rate of production of complex molecules from glucose so high that it can meet the daily needs of a human body? Please let me know.