III.1

Supporting engraftment

The FMT set recovery in motion, but the flora you have taken in must also find a home in you. This week you learn what engraftment is, and how to help it with small daily decisions, so that the new bacteria truly stay.

Összefoglaló

You are past the hardest part of the course: the new, healthy gut flora has arrived, and now the task is for it to stay. This is what we call engraftment: when the bacteria you have taken in do not merely travel through you, but find a durable home in your gut wall. From this week on, every small decision of yours — what you eat, how you sleep, how calm you are — serves to make this engraftment succeed. What is needed is not great leaps, but small daily steps.

What does engraftment mean?

Imagine that the implanted flora is like a freshly sown garden. The seeds have been scattered — that was the FMT course — but for them to sprout and take root, they need the right soil, water and light. The same happens in the gut: the beneficial bacteria^[G] you have taken in need nourishment and a calm environment in order to multiply and engraft durably. This process is what we call engraftment^[G].

The difference between a medicine and a living preparation becomes tangible precisely here. A painkiller works even if you eat pizza and sleep little afterwards. The living gut flora, by contrast, responds to how you live: if you feed it and do not disturb it, it grows stronger; if you starve it or churn it up again, it has a harder time staying. The good news is that you can influence this yourself, and with simple, everyday tools at that.

Engraftment is not the work of a single day, but a process of weeks. In the coming weeks we will gradually build up the habits — fibre, plant variety, fermented foods, rest — that keep this garden alive. For now we begin with the basics: with conscious hydration, with the first fibres, and with not disturbing the freshly arrived flora.

The protected window: now is the time to change

There is a period that is more valuable than any other moment in your recovery — and it is opening right now. The high-dose DiffBiome, together with engraftment, opens a protected window: your symptoms are already easing, but the fresh, diverse flora is only now fixing in place, and the capsule protection is meanwhile complete. The two together are the safest and most effective moment possible for building in durable lifestyle habits. The new flora takes root at this time under the protective umbrella of the capsule — what you lay the foundations for now is what consolidates under the protection of the capsule.

This is why you should not wait until the end of the course. The time for changes is now, while the capsule protects. The habits built in now — the daily fibre, the variety of plants, the calm evening — decide whether the protection remains even after the capsule. This protected window is your real insurance against relapse: the work does not begin after the course closes, but right now, at the peak of the protection.

What helps and what hinders engraftment?

The most important helper is nourishment. The beneficial bacteria live primarily on fibres^[G], which we ourselves cannot digest — but they can. This is why, already this week, we begin to bring small fibre sources into the meals: a handful of oats, a few bites of vegetables, an apple. You do not need to switch to a drastic diet, only to pair something plant-based with every meal.

The most important hindering factor is the very thing that set all of this in motion: antibiotics. This is why, during and after the course, you must avoid any antibiotic that you do not absolutely need — and if for any reason you are still given one, always tell your treating physician. Similarly to be avoided during the course are the shop-bought probiotic preparations, because they can churn up the freshly forming balance. Calm matters too: lasting stress and sleep deprivation do the gut no good either, which is why this week we pay as much attention to rest as to diet.

🩺 Klinikai blokk

Engraftment is the durable incorporation of donor microbiota strains into the recipient's gut ecosystem. The restoration of colonisation resistance — which inhibits the overgrowth of C. difficile — depends decisively on the engraftment of fibre-degrading commensal communities that produce short-chain fatty acids^[G] (SCFA), particularly butyrate^[G] (Weingarden et al., 2015). A correlation has been described between the extent of donor engraftment and the clinical response; the availability of fermentable fibre serving as nourishment is one modulable factor of engraftment.

Among the factors that impair engraftment, antibiotic exposure is the most important: as described by Dethlefsen and Relman (2011 [218]), antibiotics cause a lasting reduction in diversity, in some cases persisting for months. This is why, according to the datasheet protocol, the antibiotic must be finished at least 48 hours before starting DiffBiome, and during the course probiotic preparations are to be avoided. The donor's antibiotic-free status is itself a predictor of a more favourable FMT outcome (Grosen et al., 2025).

Day 25 – Preparing the garden

Today we begin by securing the basic conditions for engraftment: enough fluid and a first, gentle fibre source. Nothing drastic — we are just making the bed for the new flora.

A large glass of water in the morning, and at least 6–8 glasses of fluid over the day, with an extra glass after every looser stool
Pair something simple and well-tolerated and fibre-rich with one meal: a small portion of cooked oats or a peeled, ripe banana
Look over your medications: are you taking any antibiotic your doctor does not know about? If so, let them know
Remember: this is the protected window — now, under the full protection of the capsule, is the best time to build in the new habits; do not wait until the end of the course
Diary: stool count, Bristol value, bloating, fluid intake

Day 26 – Do not disturb it

Today we focus on what to leave out: those things that could disturb the freshly arrived flora.

Take the DiffBiome dose according to the usual routine: in the morning, on an empty stomach, with plenty of water
During the course, do not take shop-bought probiotics, unless your doctor says otherwise
Today, avoid alcohol and too much sugary, processed food, which favours the pathogens
Diary: stool count, Bristol, bloating, fluids, plus one sentence about your wellbeing

Day 27 – A little extra fibre

Today we do a tiny bit more: we pair something plant-based with two meals. Watch how you tolerate it.

Pair a small fibre source with each of two different meals (e.g. oats in the morning, a portion of steamed carrot at lunch)
Always drink enough water with the fibre, to make digestion easier
If the bloating intensifies, ease off the amount of fibre a little — this is not a race
If you can, add a few minutes of gentle walking to your day — gentle movement also helps the flora engraft
Diary: stool count, Bristol, bloating, fluids; note down which fibre you tolerated and how

🍽️ Eating during these days

In these three days the theme is supporting engraftment — and one of the most important tools for this is eating itself. Your tasks: take the daily dose according to the usual routine, drink plenty of fluid, do not start an antibiotic or probiotic course on your own, and pair something gentle and plant-based with every meal — on day 25 a first fibre source, on day 26 avoid the abundant sugary, processed food, and on day 27 already bring a small fibre to each of two different meals. Always drink enough water with the fibre, to make digestion easier; if the bloating intensifies, ease off the amount a little — this is not a race.

For these days, the Plant Calendar, in the firming foundation phase, recommends sources providing soluble fibre and resistant starch: on day 25 cooked sweet potato (soluble fibre, gentle), on day 26 gum arabic (acacia fibre) (gentle soluble fibre), and on day 27 resistant starch — cooled, cooked rice or potato — which is an excellent source of butyrate. These fibres feed the now-engrafting flora in the colon and support a firmer stool while the symptoms settle. Build the plant of the day into at least one meal, prepared gently; if you do not tolerate one of them well, reduce its portion and return to it later.

📊 Adat

This week, record daily:

DiffBiome dose (capsules/day) and LOT number, if the course is still ongoing;
daily stool count;
stool Bristol scale (1–7), the goal being to approach 3–4;
bloating (0–5);
bloody stool (yes/no);
fluid intake (litres);
the fibre source(s) of the day and their tolerability;
wellbeing (1–5).
Movement: type + minutes, step count (target/actual)
Stress level (1–5) and mood (1–5)
Sleep (hours + quality 1–5)

Why does this matter?

The FMT only sets recovery in motion — the durable result is decided by whether the new flora can engraft in you. This week you have learned that you can help this yourself: you feed the beneficial bacteria with a little fibre, and you do not disturb them with unnecessary antibiotics or probiotics. In the coming weeks we will build further on exactly this foundation, step by step.

[[REFERENCES]]

References

[218] Dethlefsen L, Relman DA. Incomplete recovery and individualized responses of the human distal gut microbiota to repeated antibiotic perturbation. Proc Natl Acad Sci USA. 2011. Link

This longitudinal study examined the distal gut microbiota of three individuals over 10 months spanning two courses of ciprofloxacin, analyzing 1.7 million 16S rRNA sequences from 52-56 samples per subject. Interindividual variation dominated; baseline within-subject communities were stable over months. Ciprofloxacin profoundly reduced diversity and shifted composition within 3-4 days of initiation, with incomplete and individual-specific recovery. The findings characterize gut microbiota resilience and the durable disruption caused by repeated fluoroquinolone exposure.