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.
1 Keep foods at a safe temperature. Check all foods with a food thermometer every 15 minutes to maintain food safety. Hot foods must be kept above 135 degrees F (57 degrees C).  Water bath food warmers work best if the food pan is filled with hot food.