Obesity is the result of changes of the normal mechanical, physical, and biochemical functions, either caused by a disease, or resulting from an abnormal syndrome (pathophysiological), resulting in a chronic accumulation of excess calories stored in the form of fat. Less than 3% of obesity can be attributed to glandular dysfunction. Almost without exception, the basic reason for an overweight (excess fat) condition is excessive food intake, not being able to chew the food correctly, combined with inadequate physical activity.
Refer to the articles
Digestive System, Water The Vital Nutrient, and the Chewing (mastication) process.