Q. Dear Rov, as you know, due to my severe illness I’m unable to fast on Yom Kippur. Do I still comply with the mitzva of eating on Erev Yom Kippur?
A. Nitei Gavriel (p.22 – 15: 8) quotes Sdei Chemed that this are two separate mitzvos, and one in your situation should wash and eat and enjoy the seuda of Erev Yom Kippur. He mentions that this meal may make it easier and you may be able to eat less during Yom Kippur.
Rabbi A. Bartfeld as revised by, Horav Dovid Pam, Horav Aharon Miller, Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit'a