Obesity is having an excessive amount of body fat.
Body mass index (BMI) : weight (kg) / [height (m)]2
Less than 18.5 Underweight
From 18.5 to 24.9 Normal
From 25.0 to 29.9 Overweight
30.0 or higher Obesity
It increases the risk of heart disease, diabetes, high blood pressure and certain types of cancer.
There are many reasons why some people have difficulty losing weight. Obesity is generally the result of physiological and environmental factors combined with diet, physical activity, and exercise choices.
Waste of energy/Physical activity