Possibly, maybe even probably.
Just remember that it's extremely difficult to do dietary studies, because people bring countless other variables into the equation.
Vegetarians (by choice rather than poverty) tend to be health conscious in general, so how would you plan a study and eliminate all the 'bad habits' associated with one group vs the other?
It is known that certain things about animal meats are not good, such as taking longer to digest than we were designed for, and that meat and dairy products and eggs are high in 'bad' cholesterol. They do provide protein, a few vitamins, and iron that are more work to get in vegetables. Studies seem to show that onions and garlic are good when eaten with meats to break them down. And so on. It depends, it depends...
Studies of entire cultures with similar diets overall tend to be a bit more revealing. Some countries where cattle raising is the main industry have high intestinal cancer rates, and even very poor countries who have nothing but rice and beans to live on have low rates, and that tells us something, but then they die of other things.
There's some confusion about the definition of vegetarian, so people who also eat no dairy or eggs are called vegan.
(I limit beef and pork and lamb, but eat chicken and fish and dairy, and make sure to have fresh vegetables.)
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