Are You Eating Enough? Undereating, Energy Crashes, and the Mid-Lent Wall

Are You Eating Enough? Undereating, Energy Crashes, and the Mid-Lent Wall

Somewhere around the third or fourth week of a long fast, a particular thing happens to a lot of people. Sleep gets worse. Concentration goes. The stairs at work feel steeper than they did. Prayer becomes harder rather than easier, which feels like a spiritual failure and is very often a caloric one.

Fasting is meant to be difficult. It is not meant to leave you unable to function, and the Fathers were consistent on this point — the fast serves prayer, and a body too depleted to stand through a service is not serving anything. This guide is about the difference between ascetic difficulty and simple undereating, and how to tell which one you are experiencing.

THE ARITHMETIC PROBLEM

Removing meat, dairy, eggs, and often oil from a diet removes an enormous amount of energy density without removing any hunger. Consider what happens to an ordinary plate.

A serving of chicken breast and rice: roughly 550 calories, 45g protein.
The same plate with the chicken removed and more rice added: roughly 400 calories, 8g protein.

You have lost 150 calories and 37 grams of protein, and you have added volume that fills your stomach without replacing what left. Do that three times a day for a month and the deficit is enormous. This is why people lose weight during Lent whether or not they intend to, and why the weight often comes off muscle.

The problem compounds on strict days. Oil is nine calories per gram; four tablespoons of olive oil is roughly 480 calories. Remove that from a day's cooking and you have taken out the equivalent of a full meal without noticing you did it.

THE SIGNS YOU ARE UNDEREATING

Persistent cold, especially in the hands and feet. Your body reduces peripheral circulation when energy is scarce.

Waking at three or four in the morning and not getting back to sleep. Low blood sugar overnight triggers a cortisol response.

Irritability that feels out of proportion. This is the one that damages households during Lent and the one most often mistaken for a spiritual problem.

Preoccupation with food beyond the ordinary. Thinking about the fast is expected. Thinking about your next meal continuously, planning it in detail, dreaming about it — that is a physiological hunger signal, not a temptation to be resisted.

Strength dropping noticeably in the gym, or ordinary tasks feeling heavy.

Dizziness on standing, which usually means fluid and sodium as well as calories.

Hair shedding more than usual, typically showing up several weeks after the deficit began.

If you have several of these, you are not fasting harder. You are eating less than your body needs to run, and the fix is food, not resolve.

WHAT TO ADD, IN ORDER OF EFFECT

Legumes, in larger quantities than feel normal. A cup of cooked lentils is 230 calories and 18g of protein. Two cups in a day is not excessive during a fast — it is the baseline. Beans, lentils, split peas, and chickpeas should appear at two meals a day, not one.

Nuts and seeds, eaten as food rather than as garnish. A quarter cup of almonds is 200 calories and 7g of protein. A quarter cup of pumpkin seeds is 180 calories and 9g. During a fast these are not snacks; they are a meaningful fraction of your intake. Keep them accessible — in a jar on the counter, in a bag in your coat.

Tofu, tempeh, and seitan. A 400g block of tofu is around 35g of protein. Seitan is denser still, at roughly 25g per 100g. If you are training or doing physical work during a fast, these are the difference between maintaining and losing muscle.

Oil on the days it is permitted, without guilt. On oil days, use it generously. Four tablespoons across a dish for four people is normal cooking, not indulgence, and it is a permitted day.

Bread and grains at real portions. Bread is permitted even on the strictest days. A faster is not on a low-carbohydrate diet.

Dried fruit, which is concentrated energy and has been fasting food for two millennia. Five Medjool dates are 330 calories.

Peanut butter and tahini, on days when they are permitted by your rule — the most calorie-dense fasting foods that exist.

THE MICRONUTRIENTS THAT ACTUALLY MATTER

B12 is the one that requires attention. It does not occur in plant foods in usable form. A short fast will not deplete you, since the liver holds a reserve measured in years, but if you keep Wednesdays and Fridays plus the four fasting seasons, you are eating a mostly plant-based diet all year. Fortified nutritional yeast and plant milks help; a supplement is straightforward and cheap.

Iron from plants is non-heme and absorbed less readily than iron from meat. Vitamin C taken with it changes this substantially — lemon over lentils, tomato in a bean stew, peppers in a salad. Coffee and tea within an hour of an iron-rich meal inhibit absorption; move them.

Omega-3s in plant form come as ALA from walnuts, flax, chia, and hemp, and conversion to the forms your body actually uses is inefficient. On fish days, eat oily fish deliberately — sardines, mackerel, salmon.

Calcium without dairy comes from tahini, almonds, fortified plant milks, tofu set with calcium sulfate, and dark leafy greens. Spinach is a poor source despite the reputation, because its oxalates bind the calcium; kale and collards are much better.

Iodine disappears with dairy and fish. Seaweed covers it easily, and a small amount goes a long way.

THE PASTORAL PART

Every Orthodox fasting guide says to consult your priest, and this is one of the places where it is not a formality. The fast is adjusted routinely for the sick, the pregnant and nursing, the elderly, children, those doing heavy physical labor, travelers, and those on medications that require food. This is not a loophole. It is the tradition working as designed — the canons set a standard and the priest applies it to a particular person.

If you are dizzy, losing weight rapidly, unable to work, or unable to pray because you cannot think, that is information to bring to confession rather than a discipline to push through. St. John Cassian warned specifically about fasting that damages the body's capacity for prayer, and he was writing about monks, not people with jobs.

DENSE MEALS FOR THE HARD WEEKS

The fast is a discipline of the will, not a test of how little you can survive on. Eat enough to stand through the services, work your job, and be tolerable to your family. That is the fast working correctly.

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