Q. Re Question 2062 – Is the point to eat before Chatzos, or to eat before six hours have elapsed since one has awakened?
A. On question 2062, regarding the time of the Shabbos day seuda, and if is it OK to have a drink of water before davening and then start the seuda after chatzos, we wrote: “Shulchan Aruch (O. H. 288: 1) rules that it is prohibited to fast until chatzos on Shabbos. Therefore if one drank even water and certainly other foods, he is not considered as fasting.”
“Horav Shlomo Miller’s Shlit’a opinion is that on the onset, one should not wait to eat the seuda on Shabbos morning until after chatzos, even if one drinks something before.”
The Rov added that even if six hours have not elapsed yet since one woke up, and he may not be considered yet as fasting, one should on the onset eat or at least begin the day seuda of Shabbos before chatzos.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a