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.
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. Never leave perishable food out of refrigeration over two hours. 2  If room temperature is 90 F or above food should not be left out over 1 hour. 3  This would include items such as take-out foods, leftovers from a restaurant meal, and meals-on wheels deliveries.