Digestion and fasting: why the gut loves pauses
During a pause without food, the gut turns on “clean-up,” which does not start with snacks. Why bloating and IBS quiet down during fasting, how to end the pause, and what happens with the gallbladder.
Microbiome and intolerances
One and a half kilograms of bacteria live in your gut, and they eat the same things you do. Sugar and flour feed some, vegetables and fiber feed others, and the difference means bloating, cravings for sweets, immunity and mood. The method rebuilds the microbiome in a month without a single capsule. This section is about how it happens, how to help with fermented food, and how to honestly check whether dairy and gluten are getting in your way. The main topic page is digestion and the GI tract with the method.
~1.5 kg
bacteria in the gut
2-4 weeks
change in microbiome composition
30-100 g
sauerkraut per day
30 days
intolerance test
What happens to bacteria without sugar
Bacteria that live on simple sugars and starch produce gas and substances that intensify cravings for sweets — they literally ask for more. When sugar and flour are removed, they go hungry and give way to those that digest vegetable fiber and produce butyric acid — fuel for cells in the intestinal wall and an anti-inflammatory signal for the entire body. The transition takes two to four weeks: bloating and irregular stools are possible during this time, then things become more regular than before. Full analysis — microbiome on a low-carb diet.
Fermented food: a probiotic from a jar for 100 rubles
Sauerkraut, kimchi, natural yogurt and kefir, pickles in brine without vinegar — these are live cultures in an amount no capsule can provide. Plus acids that help digest protein, plus fiber. Recommended amount: 30-100 g of sauerkraut or a glass of kefir per day, starting with a spoonful to prevent bloating. Store-bought cabbage with “vinegar” and pasteurized cabbage are dead; look for “without vinegar, live” or make it yourself. Full analysis — fermented food every day; about cabbage — sauerkraut.
Dairy and gluten: test, don’t guess
The two most common intolerances are both easy to check without tests. Dairy: lactose (sugar) and casein (protein) are different problems. Lactose-free means hard cheese and butter; casein-free means removing everything. Gluten leaves on the method along with flour, and if bread brings a reaction when you reintroduce it after a month, that is your answer. The protocol is the same: remove it completely for 30 days, reintroduce it for three days, and record the symptoms. Full analysis — dairy and gluten.
30-day intolerance test
| Step | What to do | What to record |
|---|---|---|
| Days 1-30 | remove the product completely, including hidden sources | bloating, stool, skin, sleep, energy — day by day |
| Days 31-33 | reintroduce a normal portion for 3 consecutive days | the same symptoms |
| Day 34 | compare | if worse — intolerance is present; if not — the product returns |
| Next | one product at a time | dairy and gluten — not simultaneously, otherwise you won’t know |
Digestion and fasting
A break from food is rest for the gut: peristalsis switches to “cleaning” mode, and the migrating motor complex passes through the gut every one and a half to two hours, sweeping out leftovers. It does not start at all when snacking. That is why bloating and IBS calm down during fasting. The first meal after a break should be protein and vegetables, with a little fat, not a huge portion: the gallbladder and pancreas wake up gradually. Full analysis — digestion and fasting; the first meal — first meal after a break.
Section rules
Feed bacteria vegetables
400-500 g per day, different colors. Vegetable variety means bacterial variety.
Something live every day
A spoonful of sauerkraut or a glass of kefir is cheaper than capsules and works.
Breaks from food
Three meals and a fasting window give the gut time to clean up.
Test intolerance, don’t rely on belief
30 days without, 3 days with, compare. One product at a time.
Common mistakes
- Probiotic capsules instead of sauerkraut
- Pasteurized cabbage with vinegar — there is nothing live in it
- Remove dairy and gluten simultaneously and you won’t know what was causing the problem
- A glass of kefir from day one when bloated — start with a spoonful of cabbage
- Antibiotics without fermented food afterward
Frequently asked questions
Do you need a microbiome test?
No. Commercial tests are expensive and do not provide recommendations that cannot be obtained from this section: vegetables, fermented foods, breaks.
What to do after antibiotics?
Sauerkraut and kefir from the first day after the course, vegetables, no sugar. A probiotic prescribed by a doctor may be added. Recovery takes 4-8 weeks.
Is keto flu the microbiome?
No, these are electrolytes. The microbiome causes bloating and bowel movements, while salt and water cause headaches and weakness.
Articles in this section
Microbiome on a Low-Carb Diet: Who Lives in the Gut Without Sugar
Bacteria eat what you eat. Without sugar and flour, the composition changes in a month: less gas and fewer cravings for sweets, more butyric acid. What happens and how to help.
Dairy and gluten: test them for 30 days instead of guessing
The two most common intolerances. Lactose and casein are different problems; gluten disappears on the method by itself. An elimination and reintroduction protocol that gives an honest answer without tests.
Fermented food every day: cabbage, kimchi, kefir
Live cultures in a spoonful of sauerkraut — more than in a probiotic capsule, and ten times cheaper. What counts as live, how much, how to introduce it, and how to make it yourself.
Reviewed by Anastasia Zhukova, Fitness Trainer • Author of a Nutrition and Training System • Creator of an AI Personal Support Platform
A human has reviewed this material against the method and real client practice.