AUSTIN — During a rambling press conference in the Texas Capitol, U.S. Health and Human Services Secretary Robert F. Kennedy Jr. blamed low-income Texans’ purchase of processed foods on a litany of health problems and launched into a string of unfounded claims about autism. Gov. Greg Abbott sat beside Kennedy at the event, which was meant to celebrate the Republican governor’s signing of three bills tied to Kennedy’s Make America Healthy Again agenda. One of those bills is Senate Bill 379, which prohibits Texas SNAP recipients from using their food stamps to purchase candy, soda and other foods deemed unhealthy by the state.