"Fruit and veggie eaters" being healthier is just as likely to be a confirmation bias on your part, that you simply not paying attention to contrary examples. But even if it was true and there was a correlation, there is another possible explanation for it:
People who are obsessed with health will do "X" and they will eat fruits and veggies, because both are believed to be good. "X" does a lot of good, while F&V does nothing at all. Since you don't pay attention to "X", not even knowing what it is, you come to conclusion that F&V are good, while in fact "X" is what decides who is healthy.
The point here is be careful with "I do have two eyes...".
"Fruit and veggie eaters" being healthier is just as likely to be a confirmation bias on your part, that you simply not paying attention to contrary examples. But even if it was true and there was a correlation, there is another possible explanation for it:
People who are obsessed with health will do "X" and they will eat fruits and veggies, because both are believed to be good. "X" does a lot of good, while F&V does nothing at all. Since you don't pay attention to "X", not even knowing what it is, you come to conclusion that F&V are good, while in fact "X" is what decides who is healthy.
The point here is be careful with "I do have two eyes...".