The cause of overweight often lies not in unhealthy eating habits, but in a disrupted balance of gut bacteria. Based on new scientific findings, Dr. Fedon Lindberg explains in his book how the digestive system works, how the microbiome controls what we consume, and how to achieve a healthy bacterial ecosystem in the gut that automatically leads to lower calorie intake and less fat storage, resulting in sustainable weight loss. It is crucial to limit the consumption of sugar and starch while increasing the intake of healthy fats, fermented foods, and sufficient proteins. The book offers an easy-to-follow gut diet with a 14-day meal plan and over 50 recipes.