5 Day Old Pizza … to Eat or Not to Eat?

Leftover pizza is a beloved convenience food, but concerns about its safety after several days in the fridge are common. Although cold, 5-day-old pizza might look and smell fine, there is a real risk of bacterial growth that could lead to foodborne illness. Bacteria such as Listeria monocytogenes can grow even at refrigerator temperatures and are especially dangerous for pregnant women, older adults, and those with weakened immune systems. Food safety experts generally recommend consuming leftover pizza within 3-4 days when stored at 40°F (4°C) or below. Beyond this timeframe, the risk of bacterial contamination increases significantly. To safely enjoy leftover pizza, it should be promptly refrigerated in an airtight container or tightly wrapped to minimize exposure to air and moisture, which promote bacterial proliferation. Reheating pizza to an internal temperature of 165°F (74°C) can kill many bacteria and reduce the risk, but it does not eliminate toxins that might have developed. Therefore, if your pizza has been refrigerated for 5 days, even if it smells normal, it is best to consider the risk before eating. Additionally, freezing leftover pizza can extend its safety and quality for 1-2 months. When thawing, it is important to do so in the refrigerator rather than at room temperature. In conclusion, while eating 5-day-old cold leftover pizza may be tempting, it carries a heightened risk of bacterial growth. Proper storage, timely consumption, and thorough reheating are essential to keep enjoying pizza safely. When in doubt, it's safer to discard leftovers beyond the recommended storage period to avoid potential foodborne illness.