When It is Medically Required to Eat on Yom Kippur

 https://vinnews.com/2022/10/03/when-it-is-medically-required-to-eat-on-yom-kippur/

FOODS

Ideally, one should try to space them every nine minutes.

The view of Rav Chaim Na-eh for food is 8 minutes (See Shiurei Torah 3:15).

Rav Moshe Feinstein zt”l writes (Igros Moshe OC IV #41) that b’dieved – in a case of need, they should have a gap of 4 minutes between them.

LIQUIDS

In regard to liquids one should shoot for a nine minute gap, but if not – a four minute gap.

If this is not possible, then, for liquids, one should try to fulfill the view of the Chasam Sofer (Responsa Volume VI #23) of a gap of at least two minutes.

The timing is based on the concept of the eating of a Pras – four eggs. The Mishna Brurah writes 618:20 that the shiur for this is nine minutes. These are the main views