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.
Harmful bacteria can multiply between 40 and 140 F. Set oven temperature high enough to keep the hot food at 140 F or above. Check internal temperature of food with a meat thermometer. Covering with foil will help keep the food moist.he Two Hour Rule. Perishable food should not be at room temperature longer than two hours. Discard food which has been left at room temperature longer than two hours. For room temperatures over 90 F, discard food after one hour.