This is because the crowing of crops requires much less water and land than raising the energy equivalent in livestock. To explain, consider that most livestock are primary consumers, and are one level above primary producers, in this case, food crops. So there is a large loss in energy between primary producers and primary consumers. So if people chose instead to have a plant-based diet, satisfying their dietary needs could require much less water and land resources. Most livestock, particularly in developed countries, are grain fed. Therefore, grain is cultivated specifically for animal feed, and then people consume the animal protein after a large proportion of the original energy captured by the grain is lost.
The two sisters though identical have some differences while the former avoids fatty meals and cholesterol the latter enjoys fatty meals in contrast with the statement they both exercise daily which burns out the fat
