On the contrary those of Mexican ancestry (legal and illegal) have the best infant and thematernal mortality rate. At the other end they have the best longevity rate. Mexicans are very, very healthy. One reason employers like them is that they rarely take a sick day.
Of course, in millions of them, we can find the execption to the rule.
Have you ever visited an emergency room at a hospital? Around here, they're full of latinos, all sick or ill with various ailments. And most of them are non-payers receiving medical treatment. It's rare to see whites, asians or blacks in emergency waiting rooms. The others go to regular medical offices. The latinos flood the emergency rooms for the most minor ailments, because they know they'll be treated for free.