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.
1 After cooking, keep hot food at 60Â°C (140Â°F) or hotter until itâs served. 2  Serve hot food while hot, or put it in the fridge or freezer as soon as possible once cooled (within two hours of preparation). 3  Never leave food out for more than two hours. 4  Use clean dishes and utensils to serve food.