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<p>Numerous people around the world get their protein mainly from low cost vegetarian foods like rice and beans, bread and lentils, etc… Plenty of kids in the US willingly subsisted on peanut butter sandwiches until schools banned peanut products due to life threatening peanut allergies in some students. Others will happily eat pizza all day long even if there are no meat toppings.</p>
<p>It is not like budget constrained school lunch programs necessarily have high quality meat. Cheap meat is often low in protein, being mostly fat.</p>