Obesity is a multifactorial disease caused by intake of energy-dense diet, lack of physical exercise, genetic factors, side effects of drugs and certain diseases. Out of these risk factors, unhealthy lifestyle contributes the most to the high prevalence of obesity in our society. The fundamental principle for weight reduction is to create a negative energy balance: a reduction in energy intake and an increase in energy expenditure. Diet and exercise therefore remain the cornerstone for successful weight control.
Causes of obesity
Excessive energy (calories) intake
Lack of physical exercise
Other factors such as genes, side-effects of drugs and certain diseases
To lose weight, it is suggested that a deficit of 3500-7000 calories per week, or 500-1000 calories per day, be maintained through reducing energy intake and/or increasing physical activity. Sustained adherence to these recommendations can result in weight loss of 0.5-1kg (1-2 pounds) of body weight (fat) per week in most people.
Weight management concept
Maintain body weight: energy intake = energy expenditure
