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.
nectarine / 2353 posts. When I want to keep pizzas warm, I heat up the oven to about 225 or 250, then turn it off (very important -- don't forget to do this!). Then I stick the boxes of pizza in there and keep the door closed as much as possible.