Can you eat day old mac and cheese like that was left out or will i die really to avoid dying.?

It is generally not recommended to eat day-old mac and cheese that has been left out at room temperature. Bacteria can grow rapidly in cooked pasta and dairy products, and consuming spoiled food can lead to foodborne illness. Symptoms of foodborne illness can include abdominal pain, vomiting, diarrhea, and fever. In severe cases, foodborne illness can even be fatal.

Therefore, to avoid the risk of food poisoning, it is best to refrigerate leftover mac and cheese promptly after cooking and reheat it thoroughly before eating. If you are unsure whether mac and cheese has been properly refrigerated or left out for too long, it is best to discard it to avoid any potential health risks.