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.
Plus, if the food is very hot it may take significant time for the food to cool below 40 degrees Fahrenheit giving time for unsafe microorganisms to grow in the food. It is best to let the food cool to 80-90 degrees Fahrenheit before placing in the refrigerator.