Overweight and obesitas are both measures of the body mass index (BMI): a person's weight in kilograms divided by the square of his height in meters (kg/m2). With a value over 25, a person is considered to be overweight. Values over 30 are classified as obesitas.

Overweight is the result of an energy imbalance. Too many calories are consumed (fat, sugar) with too few being expended (physical acitivity), . It increases the risk for cardiovascular diseases (heart diseases and strokes) and diabetes.

According to the WHO, 1.9 billion persons over 18 years are overweight (39%), with 600 million persons of those being obese (13% of the total number of adults).

More information: Global Nutrition Report