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.
Relevance. Rating Newest Oldest. Best Answer: An oven set at 200 degrees Fahrenheit will keep food warm and within the safety zone of above 150 degrees for about 30 to 45 minutes without affecting the food you're going to serve.....pdate: Not for cold food, it's for food I just cooked and need to keep it hot while I finish cooking other things before serving it. But information on both is good to know!! (: Update 2: How long for heating before serving: Not more than 30-45 minutes, if that.