Except there's always "that other reason".
*Science shows that vegetarians tend to live much longer and have better health outcomes than non-vegetarians"
MUH MUH MUH YOU DIDN'T CONTROL FOR EDUCATION LEVEL!
Science shows that vegetarians tend to live much longer and have better health outcomes than non-vegetarians after controlling for education level
MUH MUH MUH YOU DIDN'T CONTROL FOR INCOME!!!11!
Science shows that vegetarians tend to live much longer and have better health outcomes than non-vegetarians after controlling for education level and income
MUH MUH MUH YOU DIDN'T CONTROL FOR LEVEL OF EXERCISE!1!11!!11111111111
Science shows that vegetarians tend to live much longer and have better health outcomes than non-vegetarians after controlling for education level and income and level of exercise
MUH MUH MUH MUH <etc>
Sigh.