According to research, the lack of GLP-1 (Glucagon-like peptide 1) hormone is the main cause of inflexible metabolism that leads to fat storage in the body. This hormone helps fix conditions like obesity and type 2 diabetes by targeting metabolic action. While the hormone is at a healthy level, it makes your body adapt from carbs to fats or vice versa to burn as fuel. Thus, you will no longer be worried about what you eat but will still maintain a healthy body weight. Unfortunately, conditions like poor genetics, aging, pregnancy, stress, and toxins disrupt the levels of GLP-1 and lower them. It, in turn, makes the body unable to switch between carbohydrates and fats and starts storing everything as fat.