Obesity can be caused by any of the factors which could lead to more calorie intake than its consumption, some of them are discussed below-
Genes: Genes play a major role in the efficiency of metabolism and storage and distribution of body fat.
Socioeconomic factors: If there is no good space around the house for freshness, outdoor activities, pollution-free environment and no fresh green groceries available could cause obesity.
As described above it is caused by multiple factors, though the basic principle is decreased caloric intake and an increase in exercise is a relatively simple concept.
The need to manage obesity is must as obesity increases the risk of many other diseases and health problems like:
Osteoarthritis (especially knee and hip joint pain, and lower back pain)