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In France, 50% of people are overweight or obese. In its 2022 report, the World Health Organisation sounded the alarm: the prevalence of overweight and obesity is rising steadily – and worryingly – and not a single European Member State looks set to meet the target of halting the rise in obesity by 2025. Obesity is a serious public health problem on a global scale, leading to a host of complications, including an increased risk of cancer – because excess weight increases the likelihood of 13 different types of cancer.

Like our gut microbiota, our immune system is established from birth. The delivery method and breastfeeding play an important role in the development of our immunity. The gut microbiota of a baby born by vaginal delivery is more varied than that of one born by caesarean section. This difference explains why two babies of the same weight and size have different levels of immunity.

Seen from the sky, our blue planet does not appear to be short of water. It is true that water covers more than 70% of the Earth’s surface – but 97% of it is salty, and only 3% is freshwater. This freshwater is essential to the balance of ecosystems and our health.To make the best use of this resource, it is important to understand where it comes from and how it is used, so that we can develop the right habits individually and collectively.