No, it is not safe to eat a ready meal that has been left out overnight. Leaving perishable food, such as ready meals, at room temperature for an extended period allows bacteria to multiply rapidly, leading to potential foodborne illnesses.
The "danger zone" for food is between 40°F (4°C) and 140°F (60°C), as this temperature range provides an ideal environment for bacteria to grow. If a ready meal has been left out at room temperature (typically around 70°F/21°C) for more than two hours, it is best to discard it to avoid the risk of food poisoning.
To ensure food safety, the general rule is the "2-hour rule": Perishable food should not be left out at room temperature for more than two hours. If the room temperature is above 90°F (32°C), the safe window reduces to just one hour.
If you find a ready meal that has been left out overnight or for an extended period, it's better to play it safe and throw it away to prevent potential health risks. Always store perishable foods properly in the refrigerator or freezer to maintain their safety and quality.