If you think about it, everything on this planet is sustained by the energy from the sun. Plants convert sunlight to useable energy through photosynthesis. It then trickles down to herbivores who eat plants. Carnivores and Omnivores then eat meat to get this energy. The idea is, each time this energy converted from the sun is passed down, a part of it gets lost from thermal energy.
So in theory, you get the most energy from the sun if you eat plants as it is only passed down once, so it is more efficient if we eat plants rather than animals. Now, the only downside is, if you're a vegetarian, you have to eat a lot more varieties of plants and plant products in order to get the same type of nutrients as you get from meat.
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