The fast runs from just before sundown until nightfall the following evening — about twenty-five hours, with no food and no water. It is the most widely kept observance in Jewish life and also the one that generates the most anxious, unasked questions.
Please read the sentence that matters most first: Judaism does not want you to fast at the cost of your health. Not as a grudging exception — as law. A person who needs to eat on Yom Kippur and eats is not failing the day; they are keeping it correctly. Preserving a life outranks the fast, and it is not a close contest.
The second thing that matters: ask before the holiday. Almost every question below has a clear answer, and almost none of them can be worked out well at four in the afternoon on an empty stomach. Call us, or write, and we will go through it with you — quietly, and with no assumption that you should have known.
Who fasts
Healthy adults, from bat mitzvah for girls (twelve) and bar mitzvah for boys (thirteen), keep the full fast.
Children
Under nine, children do not fast at all. Not a shortened version, not a late breakfast — they eat normally, and it is a mistake, not a stringency, to have them skip meals.
From around nine, healthy children are trained gradually: breakfast a little later, lunch pushed back, the amount depending entirely on the child. From eleven, both boys and girls are trained to keep the whole fast — that is the standard rather than a stringency. A child who is weak or unwell still eats. Follow the child in front of you rather than a number, and feed a child who needs feeding.
Pregnancy and nursing
Unlike the minor fast days, Yom Kippur does apply to women who are pregnant or nursing — and it is also a situation where a real medical picture can change the answer entirely, and often does.
This is exactly the conversation to have in the weeks before, with both your doctor and a rabbi. Where fasting is a concern, the usual path is not “fast or don’t” but eating in measured amounts (below), which satisfies both the medical need and as much of the fast as can be kept.
Illness, age, and medication
If a physician says fasting poses a risk to you, you eat. That includes anyone managing a serious condition, anyone recently out of surgery, the frail elderly, and anyone for whom going without food or water is genuinely dangerous — including situations you would rather not discuss with anybody. You can ask us in confidence, and we have had the conversation before.
Medication. Someone who needs to take pills generally may, and swallowing them without water is preferred where possible; where water is needed, a small amount is usually permitted. Do not stop taking prescribed medication in order to fast, and do not improvise the arrangement on the day — ask beforehand and it will be straightforward.
Eating in measured amounts (shiurim). When someone must eat but the fast should be kept as far as possible, the practice is to take small quantities at intervals — food in portions smaller than the volume of a large date, about 30 ml, and liquid in amounts less than a cheekful, which each person measures for themselves — spaced about nine minutes apart, so that at no point is a full halachic act of eating performed. Nine minutes is the standard; where a doctor says that is not workable the interval can be shortened, and more readily for liquid than for food. It is a genuinely useful middle path, and the amounts are worth settling with us in advance rather than estimating on the day.
Anyone who must eat still keeps the rest of the day: the prayers, the other four restrictions, the whole shape of it. Eating is one accommodation, not an exit.
Getting through it
For those who are fasting: drink water steadily through the day before rather than all at once at the end, go easy on salt at the final meal, and if you drink coffee daily, taper over the preceding days — most of what people call a fasting headache is caffeine withdrawal. Come to shul; the hours pass very differently in a room full of people doing the same thing than they do at home near a refrigerator.
If you feel unwell — genuinely unwell, not merely hungry — tell someone. There is always someone at shul who will help you sort out what to do, and no one will think less of you for it.
The point of the day
The fast is not the mitzvah. It clears space for the mitzvah. Yom Kippur atones because of what the day itself is, not because of what you gave up; the abstaining is there so that for twenty-five hours a person isn’t tending to a body and can attend to something else. Anyone who cannot fast has lost nothing of the day’s substance.
Nothing here is medical advice, and none of it replaces a conversation about your particular situation. Call Rabbi Sholom at (941) 493-2770 or write to [email protected] — before the holiday, and about any question at all.