Another study , after what discovered how a diet rich in polyphenols can help prevent the yo-yo effect of diets , goes back to analyzing the role of good gut bacteria in health and weight loss, and how they change in depending on the type of diet we do. Changes that the body learns about and for which it behaves differently, among other things by reacting metabolically and at the level of the immune system.

In summary: the way we eat affects our bacterial flora, changing the level of good bacteria and bad bacteria. The more good (and different types) bacteria in the intestine, the higher your metabolism, the better your health, you tend to be lean and not gain weight. Food is assimilated in a different and better way.
Any change in our bacterial flora is like a message that is communicated to the body. The body makes metabolic and immune changes in response to this message.

To understand the way in which the intestinal flora communicates with our body, the researchers carried out yet another study on mice , however the results are very interesting: the mice were divided into two groups; one ate a diet rich in fruits, vegetables, complex carbohydrates of a natural type (roots, tubers); the second group ate refined grains, fats, snack sugars. In the first case, the fermentation of natural foods created short-chain fatty acids through the good bacteria in the intestine (a classic example is that of butyric acid). These acids communicate with the epigenome, which is the set of processes that allow the body to read its own DNA, but also to respond to environmental changes. So bacteria play an epigenetic role via short-chain fatty acids. The researchers therefore inserted short-chain fatty acids into rodents on a Western, fatty diet, to make up for the lack of good bacteria. Result? Here, too, there has been communication at the epigenetic level.

The more the bacterial flora, or intestinal microbiome, communicates at an epigenetic level with the body, the less fat you gain.
The more this communication is impaired or absent, the fatter you get.
What can we do? Two important things to help our good bacteria.
On the one hand, increase the consumption of natural food, such as fruit, vegetables, tubers, legumes.
On the other hand, help yourself with greater sources of short-chain fatty acids: a little raw butter, a little apple cider vinegar in the dishes (or diluted to drink before meals), some very fermented cheese for those who tolerate it, and milk.