Reigning competitive eating champion Joey Chestnut claims he was banned from the legendary Nathan’s Hot Dog Eating Contest after securing a deal with a rival food brand. Chestnut, 40, said on X Tuesday he was “gutted” over the decision made by Nathan’s and Major League Eating after claiming 16 Mustard Yellow Belts in the iconic Fourth of July competition over the past 19 years on Coney Island. Last year, Chestnut downed 62 hot dogs in 10 minutes. “I love competing in that event, I love celebrating America with my fans all over this great country on the 4th and I have been training to defend my…