432 FOOD FACTS Keeping food FRESH in WARM WEATHER NOW that we are suffering from a world shortage of food, it's specially important to guard against the possibility of food going bad and becoming unusable in warm weather. Although this may involve extra trouble, it's well worth while. Here are some suggestions for keeping perishable foods fresh: MILK: The best plan, on very hot days, is to heat the milk nearly to boiling point as soon as it is delivered. The milk should then be cooled as quickly as possible by standing in a jug in a bowl of cold water.