Health care professionals are torching Robert F. Kennedy Jr.’s response to a slew of measles cases popping up across the country. The health and human services secretary suggested Monday that a poor diet could have been behind the death of a West Texas child who contracted measles. “It’s very, very difficult for measles to kill a healthy person,” Kennedy told The New York Times , adding that there is “a correlation between people who get hurt by measles and people who don’t have good nutrition