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 Refrigerate cold foods at 40 Â°F or lower until serving time. 2  If the food is hot, and youâll be eating within two hours, keep it hot (140 Â°F internal temperature) in a 200 Â°F to 250 Â°F oven. 3  Keeping food warm is not enough because harmful bacteria can multiply at temperatures between 40 and 140 Â°F. If the food is hot, and youâll be eating within two hours, keep it hot (140 Â°F internal temperature) in a 200 Â°F to 250 Â°F oven. 2  Keeping food warm is not enough because harmful bacteria can multiply at temperatures between 40 and 140 Â°F. 3  Covering with foil will help keep the food moist while in the oven.