One issue is vitamin B-12 deficiency, which is a necessary nutrient found only in animal foods. Vitamin B-12 pills are poorly absorbed. No 100% vegetarian population exists, except for India which eats lots of dairy.
Protein is okay in vegetarian diets, but Zinc is low. The recommended dietary allowance for Zinc is 11 mg daily, but due to anti-nutrients in seeds, the vegetarian requirement is 15 mg. Vegetarians usually do not consume enough zinc.
But it has health benefits over the standard diet because we eat less fruits and vegetables. Anthropological/nutritional evidence shows that we should eat mostly plants with some animal products. Our hominid species evolved to eat red meats, but only during successful hunts and probably not daily.
Vegetarians choose this diet to avoid causing pain to animals. However, the U.S. Humane Slaughter Act requires animals to be painlessly knocked unconscious before slaughter. Rubbing the belly of a crab knocks it unconscious before cooking. Oysters arguably feel no pain. Fish poisons such as Jamaican Dogwood are non-toxic to humans but painlessly sedate and kill fish.
Vegetarians also believe that it takes more energy to grow meat than to grow plants, but this isn’t true for grass fed meat. Fish farming can be more sustainable than extra plants for vegetarians if managed to avoid overfishing. Oyster farms are good for ecosystems.
Despite all this, and despite that most vegetarians are non-judgmental and aren't affiliated with PETA in anyway, many get a good dose of humor out of bashing them. Presumably because the concept of not eating meat challenges their manhood and they need to defend their metaphorical dick size.
*at dinner with a group of people*
Person A: Yeah, I'll have a vegetarian burrito please.
Person B: OH GOD. Oh what, are you a VEGETARIAN? Huh? You think you're too good for us?
Person A: Uhhh, no.
Person B: Yeah, I can see it in your eyes! You're not gonna stop the rest of us I hope you know!
Person A: You knowwww.... I really didn't plan on it. Eat what you want; it's your choice.
Person B: I told you you can't stop us! GOD, what is it with you people?! I'll bet you're a FASCIST too aren't ya? And a faggot. GOD, you make me sick. I bet you just can't STAND the thought of me eating a steak, can you? Huh? HUH?
Person A: Wow, you're an idiot.
2) One who does not eat meat. This includes fish and poultry (chicken and fish are not plants!)
not to be confused with vegan
2)An awesome person.
Many omnivores think that we go around preaching every damn minute of the day about our opinions...NEWSFLASH, not every vegetarian does that you know.
Vegetarian: Um..no. Go away.