It is an old story that a vegetarian diet is linked to a more efficient use of resources than a meat-rich diet. One of the reasons cited for this is that meat is taken from a higher level on the food chain, and thus about one tenth of the energy that enters the system is used per culinary unit (calorie, meal, whatever) than for vegetables. However, this argument, while partly true, overlooks a lot of other factors. For instance, the meat is a more efficiently used package for some purposes than the veggies. Think about it this way: A certain percentage of the food you eat is used to build tissues, including tissues used in growth (for growing individuals), for repair of tissues, as well as for immune system products. Meat is essentially the same “stuff” as is produced in these processes, so the balance of amino acids, co-enzymes, etc. in a chunk of meat is very closely matched to the need. Most of the food we eat is used as an energy source, and both meat and veggies have such energy in them, to varying degrees. With respect to energy alone, the most efficient diet may be something like pure sugar produced from prairie grasses or something along those lines.
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