Food exposed to radiation becomes radioactive and is therefore not edible.
Food is the most serious problem.
Most food that is in the house will not be harmed by the radiation, no matter how intense. There are three types of radiation that are found in fallout. Alpha particles, beta particles, and gamma rays. As the first two names indicate, they are particles. In any case, these particles may be simply washed off many types of foods that have a natural covering, such as eggs, bananas, potatoes, oranges, etc., or off well sealed foods such as those in vacuum packed cans.