A recent study shows that Puerto Ricans have the highest chance of chronic illness among all Latino groups in the US, followed by Mexican Americans. In fact, 3 out of 10 Puerto Ricans have chronic illnesses such as diabetes or heart disease.
Overall, Hispanic adults in the US have poorer health than non-Hispanic adults. The study showed that 16.8 percent of Latino adults in the U.S. have fair or poor health ratings vs 11.9 percent of non-Hispanic adults.
Here is an article discussing this study in more depth: http://www.nbcnews.com/news/latino/among-latino-groups-puerto-ricans-mexican-american-poorer-health-n594401