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.
Meanwhile, remove the racks from the oven, line the bottom of the oven completely with foil, and then turn on the oven to preheat to 175Â°F. Maintaining a steady 175Â°F is really important so use an oven thermometer to confirm that the temperature reaches 175Â°F and remains there.