Once “the fat kid,” Leigh Mount says she grew up into an adult who only ate snack foods that came in “bright colored crinkly bags.”The larger she became, the more she fueled her depression with binge eating and drinking, she revealed on Monday’s “Look at Me Now, Joy Fit Club” spotlight.At her heaviest, the 30-year-old Texan weighed 319 pounds. But two years ago, she stopped her unh