1 Having high or low cholesterol does not exclude a person from donating blood. 2  Potential blood donors may be temporarily prevented from donating if they have a low level of iron (hematocrit) in their blood.
Headline Clickable. To keep food warm without overcooking, set your oven to the lowest temperature (which is probably 200 degrees F) and cover the food with foil.eadline Clickable. To keep food warm without overcooking, set your oven to the lowest temperature (which is probably 200 degrees F) and cover the food with foil.
Once food has been thoroughly cooked, you can safely hold it in a warmer, chafing dish, low-temperature oven or slow cooker for several hours. But food left in a warmer for more than two to four hours loses its freshness and starts to dry out. The food has to consistently remain at a temperature above 140 degrees Fahrenheit to keep it safe.