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The power of your gut

The longer the physical activity, the better for the microbiota

Physical exercise
The gut microbiota Obesity Type 2 diabetes

Intense physical exercise is not necessary for a healthy microbiota. According to a recent study, what really counts is staying active for at least 2.5 hours a week and keeping in shape.1

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About this article

Created 10 July 2023
Updated 26 August 2024

We already knew that top athletes’ microbiota differs from that of sedentary people, and that intense physical activity has a significant impact on the gut flora. 

But how does more moderate physical activity affect our health? Moreover, is the impact the same regardless of weight?

Several hundred volunteers enrolled

To answer these questions, researchers from Canada and European research institutes recruited 350 men and women aged between 38 and 65 and divided them into two groups: one made up of volunteers of normal weight ( (sidenote: Body Mass Index (BMI) Body Mass Index (BMI) assesses the corpulence of an individual by estimating the body fat mass calculated by a ratio between weight ((kg) and height squared (m2). https://www.nhlbi.nih.gov/health/educational/lose_wt/BMI/bmicalc.htm https://www.euro.who.int/en/health-topics/disease-prevention/nutrition/a-healthy-lifestyle/body-mass-index-bmi ) between 18.5 and 25) and the other of overweight people only (BMI between 25 and 30, i.e., not obese).

05.01.2022 The gut microbiota: new hope in preventing childhood obesity? Read more

The scientists asked them what types of physical activity they performed on a daily basis: rather light (walking, washing up, cooking, etc.), moderate (brisk walking, gardening, cycling, badminton, etc.), or intense (heavy work, running, weight training, basketball, football, etc.).

They also recorded the number of hours devoted to these activities for each participant (less than 2.5 hours, between 2.5 and 8 hours, or more than 8 hours).

Lastly, the researchers collected stools from all participants in order to analyze their gut microbiota.

WHO recommendations on physical activity

We all know that physical activity is essential for both physical and mental health, and that a sedentary lifestyle is a major cause of chronic illness and obesity. 
The World Health Organization defines physical activity as “any bodily movement produced by skeletal muscles that requires energy expenditure”, whether this movement is carried out during work, leisure, or when traveling.
But how much time should adults devote to this activity in order to reap the benefits? According to the WHO, at least 2.5 to 5 hours of “moderate-intensity”, activity per week, or 1.25 to 2.5 hours of “vigorous-intensity” activity per week. A combination of the two is also possible.
Another recommendation was to limit the amount of time being sedentary or, where this is not possible, to compensate for the harmful effects of a sedentary lifestyle by devoting more time to activity than the recommended levels. 2

Health benefits for all, but more comprehensive benefits in slim people

The results showed that improvements in the diversity and richness of the microbiota are linked more to total hours of physical activity than to the intensity of that activity. Regardless of your weight, at least 2.5 hours of physical activity a week is enough to benefit your gut.

This is good news for those who are overweight, since diversity and richness are associated with a lower risk of chronic illness (diabetes, obesity, cardiovascular disease, etc.) and a more resilient microbiota.

Despite this, only the normal-weight volunteers (BMI < 25) saw changes in bacterial composition. The more time these volunteers devoted to physical activity, the richer their microbiota became in:

  • Actinobacteria, a group of bacteria known for multiple benefits to cardiometabolic health, e.g., lower cholesterol, the production of acetate –  (sidenote: Short chain fatty acids (SCFA) Short chain fatty acids (SCFA) are a source of energy (fuel) for an individual’s cells. They interact with the immune system and are involved in communication between the intestine and the brain. Silva YP, Bernardi A, Frozza RL. The Role of Short-Chain Fatty Acids From Gut Microbiota in Gut-Brain Communication. Front Endocrinol (Lausanne). 2020;11:25. )   –, the digestion of complex carbohydrates such as resistant starch;
  • Collinsella, bacteria belonging to the Actinobacteria family, which protect against gut permeability and produce butyrate, another SCFA with anti-inflammatory properties.

Impact also depends on gender

Another finding was that in normal weight men, as well as overweight women, the greater the grip strength, the higher the abundance of Faecalibacterium prausnitzii, bacteria known for their anti-inflammatory properties and effects countering (sidenote: Dysbiosis Generally defined as an alteration in the composition and function of the microbiota caused by a combination of environmental and individual-specific factors. Levy M, Kolodziejczyk AA, Thaiss CA, et al. Dysbiosis and the immune system. Nat Rev Immunol. 2017;17(4):219-232.   ) .

BMI and gender therefore play a role in how physical activity impacts the microbiota. This is another major advance in our understanding of how the gut-muscle axis works.

The gut microbiota

Learn more

"That's fascinating! Physical activity can indeed have a positive impact on your gut microbiota. It's all about nurturing a diverse microbial ecosystem in your gut, which can support better digestion and overall health. Remember, what matters most is finding an activity you enjoy, as consistency is key to reaping the rewards." -Aware Health Rewards App (From My health, my microbiota)

Sources

1. Shah S, Mu C, Moossavi S, et al. Physical activity-induced alterations of the gut microbiota are BMI dependent. FASEB J. 2023 Apr;37(4):e22882.

2. Activité physique – Principaux repères – OMS, octobre 2022.

Tags
Sport Obesity Overweight Performance Dysbiosis SCFA BMI Microbiome Flora

    See also

    Why running could bring a smile to depressed teens... and their gut microbiota
    Actu GP : Sport et microbiote : une question d’équilibre ! Exercise and microbiota: a question of balance
    Created 10 July 2023
    Updated 26 August 2024

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