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The power of your gut

Smoking cessation and weight gain: the gut microbiota, my slimming partner!

Smocking
The gut microbiota Obesity Fecal transplant Diet

The downside of the good resolution to stop smoking: additional kilos. Good news a recent study shows that it is not inevitable but a simple consequence of the imbalance of the microbiota caused by tobacco. So all that is left is to rebalance the microbiota!

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About this article

Created 04 April 2022
Updated 21 April 2022

Unfortunately impedes some attempts to stop smoking: former smokers tend to put on weight. On average an extra 4.5 kg on the scales 6–12 months after the last cigarette. Something that discourages the best intentions. Unless our gut microbiota offers us welcome assistance? In any event, this is what is suggested by a recent study in mice.

Leading avoidable cause Smoking is the most avoidable cause of disease and death in the world.

7.2 million Each year, smoking is responsible for over 7.2 million deaths worldwide, killing more people than AIDS, malaria and tuberculosis combined.

1 in 4 Europeans According to the WHO, Europe has the highest prevalence of smoking among adults (28%), that is 1 in every 4 Europeans.

Sources : (sidenote: https://www.euro.who.int/en/health-topics/disease-prevention/tobacco )

Smoking cessation: a microbiota that carries weight

As in humans, mice exposed regularly to cigarette smoke tend to gain weight after stopping smoking. After a long series of experiments, the researchers seem to have identified the mechanism potentially in play. Some compounds in tobacco (nicotine?) are thought to be able to reach the digestive system of “smoker” mice after traveling in the blood. They are then thought to modify the composition of the gut microbiota. And in fact, it is enough to transplant the microbiota of smoker mice into non-smoker mice to make them gain weight. Something that designates this microbiota as being partially responsible for the kilos gained.

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The mechanisms involved elucidated?

But in practice, how is this possible? It would appear that smoking disrupts the delicate balance between the molecules that promote weight gain and others that restrict it. In smokers, the molecule that promotes weight gain is thought to be produced in greater quantities, whilst the molecule that blocks it becomes increasingly scarce. So why don't they get fat? Because the mechanism is gradual, allowing the body time to adjust by associating every cigarette lit to the necessity to eat less. Except that on stopping smoking, this appetite-suppressant effect of the tobacco disappears immediately, while the imbalance in the microbiota that encourages weight gain lasts much longer. Direct consequence: the scales go into panic mode!

Supporting ex-smokers

“The compounds that we identified could lead to new treatments that will help people to avoid gaining weight when they stop smoking”

said Prof. Evan Elinav who led the research team. While waiting to find out how to repair the microbiota of ex-smokers (diet? microbial therapy, (sidenote: Postbiotics A preparation of inanimate microorganisms and/or their components that confers a health benefit on the host  Salminen S, Collado MC, Endo A, et al. The International Scientific Association of Probiotics and Prebiotics (ISAPP) consensus statement on the definition and scope of postbiotics. Nat Rev Gastroenterol Hepatol. 2021 Sep;18(9):649-667.    ) ?) in order to limit weight gain after quitting smoking, this study makes a “weighty” argument for never smoking your first cigarette, or exposing those around you to passive smoking: protecting the equilibrium of the microbiota.

Sources

Fluhr L, Mor U, Kolodziejczyk AA et al. Gut microbiota modulates weight gain in mice after discontinued smoke exposure. Nature. 2021 Dec;600(7890):713-719.

Tags
Tobacco Quitting smocking Postbiotics Obesity Weight

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    See also

    Actu GP : E-cigarette : conséquence sur le microbiote oral et risque d’infections ? Impact of e-cigarettes on oral microbiota and risk of infection
    Bandeau_Article3_DTO Urgent need to reassess eating habits
    Created 04 April 2022
    Updated 21 April 2022

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