Jay Z, who’s announced he’s going vegan, isn’t the only celeb getting health-conscious. The Knicks’ Tyson Chandler — who’s recovering from a non-displaced fracture of his right fibula — tells us he’s been on a “gluten-free” diet for three weeks. “I really want to get back on the court, so I’m paying attention to what I take in,” he said Tuesday night. “You almost can’t taste the difference.” Chandler says he’s “feeling better” and will return to practice next week.