Definition: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
Input: Question: I've been looking around the Internet. Some websites say that foods is incorrect but others say it is correct. 
Answer: Food in its commonest sense is a non-countable noun, with all the effects of that. It's already a plural. You would eat "some food" not "a food". You would say "less food" not "fewer foods". However, there is a less common usage where "a food" means "a type of food": "Cheese is a food made from milk" ... and in this form, you can pluralise it ... "Italy is the source of many delicious foods -- pizza, pasta, salami, biscotti..." For comparison, think of "a people" - Are there meta-plurals beyond "peoples"?.

yes