The stomach is a muscular sac that is important for absorbing food and preparing food for further digestion.
According to the WHO, Obesity and overweight are defined as the accumulation of abnormal or excessive fat in the body. Body mass index or BMI is a crude measure of obesity. BMI is an individual?s weight (in kilograms) divided by the square of their height (in meters). An individual who has a BMI of 30 or more is characterized as obese and an individual who has a BMI of 25 or more is characterized as overweight. Obesity occurs gradually over time as a person eats more calories than they use. The factors that may increase the risk of obesity are genetics, overeating, eating foods rich in fats and sugars and lack of physical activity. Both obesity and overweight act as major risk factors for numerous chronic and life-threatening diseases such as diabetes, stroke, heart disease, arthritis and cancer. Losing even 5 to 10% of body weight may decrease the chances of getting these diseases.