Wrong. Although many germs cause spoilage that affects the look, texture, smell and taste of food, most of the ones that make you sick are undetectable by your senses. So, it’s important to get all Christmas leftovers into the fridge or freezer, in a sealed container, within 2 hours of serving - or sooner if it’s a warm day. Here’s how long you can keep different leftovers in the fridge: