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.
For longer than this, check frequently with a food thermometer, to assure the food is remaining at a temperatures of 140 degrees F or above. If necessary, adjust the oven's temperature to a higher setting. Keeping foods hot for extended periods (more than a couple of hours) may reduce the quality of the food. Examples of keeping foods warm include: Place pancakes or waffles in a single layer on a baking sheet as they're made if you want to serve them all at the same time.