Reb Eliezer, which “individual” are you referring to?
My question to you is if your doctor said to eat on Yom Kippur and then your Posek/Rov (let’s say the Mattersdorfer Rov, if that’s your Rosh Yeshiva) paskens, after hearing your doctor’s order including all the reasons behind it, that you are not permitted to eat on Yom Kippur. Would you follow your doctor’s orders or your conflicting Posek’s order?