Can you restore your gut microbiome after a course of antibiotics?
Your gut microbiome partially recovers after a course of antibiotics, but a full return to its original state is rarely achieved. Probiotics do not demonstrably help with this; give your body time and discuss with your doctor whether a course of antibiotics is truly necessary.
Antibiotics cause major damage to the gut microbiome. Ciprofloxacin significantly reduces diversity within just three to four days. With a heavier combination of three broad-spectrum antibiotics, potentially harmful bacterial species temporarily disappear in the immediate aftermath, but at the same time beneficial species such as bifidobacteria and butyrate-producing bacteria decline sharply.
Recovery does occur, but is rarely complete. After a course of ciprofloxacin, the composition of the gut microbiome in all study participants still differed from its baseline ten months later. After the heavier triple course, the microbiome had largely returned after six weeks, but nine species that had been present in everyone before the course were still undetectable in most participants after six months. How much you recover varies considerably: there is no single recovery pattern, and even in the same person a second course plays out differently from the first.
Taking probiotics after a course of antibiotics sounds logical, but the opposite has been shown. Compared with people who took nothing extra, gut microbiome recovery in the gut lining was actually slower and incomplete in the group that took probiotics (a multi-strain product). Probiotics can reduce antibiotic-associated diarrhoea, but that is separate from actual restoration of the microbiome.
The fastest and most complete return was achieved with an autologous faecal transplant: stool that a person had frozen before the course and then had reintroduced afterwards. Within a few days the microbiome was almost entirely back, clearly faster than spontaneous recovery or recovery with probiotics. However, this is not a method that is readily available or applicable to everyone; it has so far been studied in a small group of participants.
Based on three human studies, including a small study in three individuals (ciprofloxacin, PMID 20847294), a study in 12 healthy young men (PMID 30349083), and a study with three groups receiving probiotics, an autologous faecal transplant, or nothing (PMID 30193113). All findings were obtained in humans, but the groups are small. No meta-analyses are available in this set.
Can a disrupted gut microbiome weaken your immune system?
A disrupted gut microbiome demonstrably dysregulates your immune system and increases the risk of chronic inflammation. Eating fermented foods is the best-supported way to do something about it.
Can you permanently change your gut microbiome through diet?
Diet does indeed change your gut microbiome, but lasting change requires lasting adjustment of your dietary pattern; a temporary diet has only a temporary effect.
Can you improve your gut microbiome by picking up bacteria while playing outside?
Playing outside exposes your child to more bacteria, and one small study observed a change in gut microbiome, but whether that is structurally beneficial for health has not yet been demonstrated. Diet, mode of birth, and medication use have a far stronger evidence base when it comes to shaping the gut microbiome.
Can your gut microbiome influence inflammation in your body?
Your gut microbiome can influence inflammatory processes throughout your body via the gut wall. Eating more fibre and exercising regularly are the most well-supported ways to influence this favourably.
What are the signs that your gut flora is out of balance?
There are several recognisable signals, of which abdominal complaints such as persistent pain, diarrhoea, or constipation are the best supported. If you experience prolonged bowel complaints after a course of antibiotics or an infection, discuss this with your GP.
Can your gut microbiome influence how long you live?
There are clear associations between a healthy, diverse gut microbiome and older age, but whether that microbiome promotes longevity or is itself a consequence of being healthy has not yet been proven. For now, a varied diet rich in fibre is the most concrete tool for supporting your gut microbiome.