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.
Place it in the centre of the oven and set the oven to 175 degrees Celsius. Check the temperature shown on the thermometer after 20 minutes and if it's not within five degrees of 175, you'll need to get the oven professionally calibrated.his is a good temperature to choose if you are not sure of the temperature you need. This temperature will work well for everything from pies to cakes and even pasta bakes. A high oven means a temperature of around 230 degrees Celsius.