Noshing on Thanksgiving leftovers is just as much of an American tradition as a roast turkey dinner with all the classic sides. But it’s important to enjoy your leftovers with caution, to stay safe and avoid foodborne illness. After all, you don’t want to spend your long holiday weekend laid up with food poisoning. Generally speaking, leftovers can be stored safely in the refrigerator for three to four days. “After that, the risk of foodborne illness increases, as bacteria may begin to grow,” says Zachary Cartwright, lead food scientist at Aqualab…