French Gut Kids: the extension of the “French Gut” focused on the gut microbiota of the children aged from 3 to 17 yo.

Dec 18, 2025
Sébastien Bouley

Following the successful launch in 2022 of the French Gut project – the French microbiota project led by INRAE ​​and AP-HP, which aims to collect and analyze stool samples from 100,000 volunteers by 2029 to map the microbiota of the French population – the French Gut Kids extension is going to focus on the gut microbiota in children aged from 3 to 17. How is it developed from birth? What roles do diet, lifestyle, and the environment play in its diversity? How is it transmitted from parent to child? These are just some of the questions this citizen science project seeks to answer in order to better understand and protect the health of younger generations.

Led by INRAE ​​in collaboration with AP-HP, the Le French Gut project – the French microbiota – and its extension Le French Gut Kids is conducted by the MetaGenoPolis unit located at the INRAE ​​site in Jouy-en-Josas (Yvelines, Île-de-France). This research is carried out with several public or recognized public-interest partners (Inserm, Institut Pasteur, CEA, AgroParisTech, Inria) and private partners (Biocodex, Biofortis, Danone Nutricia Research, GMT Science, Greentech, Lallemand Health Solution, MS nutrition, Anjac Health and Beauty, DSM-Firmenich).

The French Gut Kids extension aims to collect fecal samples from 10,000 children aged 3 to 17 by 2029, both healthy and sick, in all regions of mainland France. The goal? The project aims to characterize the diversity of the gut microbiota in young people in France, study the impact of daily life (diet, lifestyle, and family environment), understand the vertical transmission of bacteria (from parent to child), and explore the links with certain common childhood illnesses such as asthma, allergies, and intestinal diseases. It also seeks to raise children’s awareness of the importance of the microbiota for health and the role of diet in maintaining it. To this end, an educational communication kit, entitled “My Gut Microbes,” has been created for 6-13 year olds, with the support of the Zorba agency. It includes a 5-episode podcast, a video accompanied by an educational brochure, and an interactive digital tool. This kit is intended for distribution in institutions that serve children and teenagers (hospitals, schools, exhibitions) and for sharing on social media.

To know more you can consult:

the press communique (French)