About Cristina Sáez

Cristina Saez is a freelance science journalist. She coordinates the science section of the newspaper ARA and writes for several media, such as National Geographic Magazine, research centers, and scientific societies. She has been awarded for her journalistic work with some awards, such as the Boehringer Ingelheim, the Roche Foundation, Accenture, or Concha Garcia Campoy Awards, all in Medical Journalism. She is the author of "La ciencia de microbiota" (Cúpula, 2022) and "Siempre adelante", the memoirs of the Cardiologist Valentí Fuster (Cúpula, 2024). Follow Cristina on Bluesky @crisaez.bsky.social

Human milk does more than nourish, it also delivers beneficial microbes that help build the infant gut microbiome. A new study from the University of Chicago offers the most detailed look yet at how bacterial strains in breast milk are transferred to babies. The findings shed new light on early-life microbial transmission and its potential impact on long-term health.

Childhood is a crucial period for building the gut microbiome, yet it remains one of its least studied phases. Le French Gut Kids aims to fill this gap by analyzing gut microbiota and lifestyle data from children and adolescents across France. The project seeks to better understand how early gut development may influence health throughout life.

Fiber and cancer prevention: what science says

26 Feb 2025

by Cristina Sáez

A new study reveals that consuming fiber-rich foods can play a crucial role in cancer prevention. The research shows that some products of fiber digestion by gut microbiota, such as butyrate and propionate, can alter gene expression and exert anti-tumor effects. These findings highlight the importance of including whole grains, vegetables, fruits, legumes, and nuts in our daily diet to support long-term health.

The fundamental role of gut bacteria in overall health has been recognized for years. Imbalances in its composition have been linked to autoimmune, gastrointestinal, and metabolic diseases, and now also to cardiovascular conditions. Increasingly, scientists are studying the gut-heart axis and suggest that the gut microbiota could become a new therapeutic target for preventing and treating heart diseases.

What’s in the sandwich you are eating?

16 Oct 2024

by Cristina Sáez

For the first time, a European group of researchers have analyzed the microbiome of more than 2,500 different types of foods. The insights gained will help better identify good and bad ‘bugs’ and improve the quality and safety of existing products. Additionally, the research sheds light on the influence of food microbiome on our own gut microbiome and overall health.

The microbial colonization of a baby's gut is primarily influenced by the mother's vaginal microbiota during birth and by breast milk. Two new studies have found for the first time that fathers also contribute to the establishment of the baby's microbiota, which could have health implications.

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