People who live in poor countries have diets that are made up primarily of plant materials. This is because

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All of the provided reasons contribute to why people in poor countries have diets primarily made up of plant materials. Plant foods are generally less expensive than animal foods, feeding plants to animals results in a loss of calories that could have been directly consumed by humans, and more people can be supported on a diet at the herbivore level due to the efficiency of energy transfer in the food chain.

People Who Live in Poor Countries Have Diets That Are