The passage suggests that ……………

All food depends on the capture of the sun's
energy by plants via the process of photosynthesis. When Mankind eats these plants, he makes efficient use of the Earth's resources in terms of energy conversion. In fact, poorer people generally have little other choice, but richer ones favour meat in their diet, which is more nutritious as it contains more calories due to the slower energy conversion process. In many countries, stomachs are filled, but a more subtle form of hunger remains. Unless the body receives enough proteins, minerals and vitamins, it cannot function properly. Many disorders and diseases are the inevitable result of this malnutrition.