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.
The answer depends on the type of cooker employed. Some don't have a keep-warm feature so as soon as the temperature falls below 140F the 2-hour clock begins ticking. Those that have a keep-warm setting should maintain the temperature at or above 150F so, in theory, you should be able to leave it in the cooker overnight if you wanted.