"To contaminate the food" means to introduce harmful substances or bacteria into the food, making it unsafe to eat and potentially causing illness. Full definition
Such an infection is caused by the ingestion of contaminated food, for instance ice cream or raw eggs, and can cause severe diarrhea. (sciencedaily.com)
But local wildlife were exposed both externally to radiation in the environment and internally from contaminated food sources. (sciencemag.org)
Up to 70 % of travelers experience the uncomfortable effects of digestive issues from eating contaminated foods while traveling. (ordinarytraveler.com)