At every meal, billions of microorganisms in the intestine feed on what we consume. These intestinal bacteria, collectively known as the intestinal microbiota, play a role in weight regulation, immune function, and appetite control. Maintaining a healthy balance of these microbes doesn’t require a complete overhaul of one’s diet—small changes in what’s on the plate can make a meaningful difference. To function properly, the intestinal microbiota needs to be fed. This primarily happens through the food we eat. Dietary fibers act as a food source for these bacteria. Through a process called fermentation, they produce short-chain fatty acids, such as butyrate. These molecules support the proper functioning of colon cells, help regulate inflammation, and encourage the production of GLP-1, a hormone that contributes to the feeling of fullness. Health authorities recommend that adults consume about 28 grams of fiber per day. However, many people in France fall short of this target. Fortunately, increasing fiber intake is achievable through accessible solutions. Foods like legumes, whole grains, fruits, vegetables, and even under-ripe bananas are rich in fiber. Additionally, resistant starch—another type of carbohydrate that some intestinal bacteria enjoy—can also help boost fiber intake. Incorporating more fiber-rich foods into daily meals can support the health of the intestinal microbiota and, in turn, improve overall well-being. Simple dietary adjustments, such as choosing whole grains over refined ones or including more vegetables in meals, can contribute to a healthier gut environment.