Today I am continuing my examination of whether or not capital is the binding constraint for meeting humanity’s needs. The prior post looked at our needs for oxygen and water. Calories. To power our bodies, adults need between 1,500 and 3,200 calories per day, a need we mainly meet by eating and drinking. The best way to obtain calories, however, is surprisingly poorly understood – the mix between proteins, lipids and carbohydrates is subject to debate. Eating food is the primary solution to ...