question #3 Sahih Muslim 1123d, Book 13, Hadith 141 : What role does the consumption of food or drink play in determining the validity of a fast?

Umm al-Fadl (Allah be pleased with her) is reported to have said that some people among the Companions of the Messenger of Allah (ﷺ) were in doubt about fasting on the day of ‘Arafa and we were with him on that day. I (Umm al-Fadl) sent him a cup of milk and he was halting at ‘Arafa, and he drank that.