Experts advise balanced pre- and post-fast eating during Yom Kippur to prevent health pitfalls

Dietitians and medical authorities emphasise the importance of planning and moderation before and after Yom Kippur fasting, warning against overindulgence and rapid carbohydrate intake to maintain wellbeing during the religious observance.

As Yom Kippur approaches, the question is not only whether to fast, but how to prepare for the hours before and after it. According to Israel Hayom, clinical dietitian Veronika Meisler argues that the body responds better to planning and balance than to simple overeating, while Johns Hopkins Medicine notes that fasting patterns are not suitable for everyone and should be approached carefully. The main lesson is that fasting is shaped as much by what comes before and after it as by the fast itself.

Meisler’s advice is that the pre-fast meal should be built, not piled high. A larger plate does not necessarily translate into lasting fullness, and it can leave people feeling heavier and more thirsty once the fast begins. A better approach, she says, is to combine protein, carbohydrates and some fat in sensible proportions, with vegetables and enough fluid during the day so the body is not forced to catch up at the last minute. That advice broadly matches guidance from Cleveland Clinic and St. Luke’s on exercise nutrition, which also stresses the value of carbohydrates, protein and hydration over excess.

The tradition of breaking the fast gradually also has a physiological logic. Israel Hayom reports that many Jewish communities begin with sweet tea, cake, fruit or soup, but Meisler cautions against flooding the body with sugar after a long dry fast. She says a rapid rush of simple carbohydrates can drive a spike in blood sugar and insulin, which may be followed by fatigue, cravings and a quicker return of hunger than people expect. A gentler opening, such as water or tea followed by a small, balanced snack, is more likely to restore comfort without overwhelming the stomach.

That does not mean tradition has to disappear. Meisler’s view is that familiar foods can stay on the table if they are used more sparingly and alongside water and a little patience before the full meal resumes. In that sense, the most useful fasting habits are not new at all: start hydrated, avoid extremes, and give the body time to adjust. Johns Hopkins Medicine says intermittent fasting is a recognised eating pattern, but it is not appropriate for everyone; the same common-sense caution applies to religious fasts as well.