The causes of overweight and obesity have not fully understood, you know that there are many factors that cause them, even can be several causes of obesity and overweight in an individual, then we will mention some of these factors: energy imbalance: in the majority of people overweight and obesity arise when the body is not able to consume all the energy or calories that are ingestedto maintain a stable weight this consumption must be somehow balanced, overweight and obesity usually appear over time when you eat more calories than you consume. Lack of physical activity: people who maintain a low level of physical activity, are more likely to gain weight since they cannot burn or consume the ingested calories, the reason for this is by the time we dedicate to activities in which physical activity is minimal. In these modern times in which technology and amenities are common, these dismuido have the physical demands, the sedentary people they tend to gain more weight due to the little physical activity and as a result do not consume calories. It is amply demonstrated that physical activity is one of the boosters of the use of energy in the body, increasing physical activity is achieved the body may need to use more calories. Environment and neighborhood: sometimes the environment conspires against us due to the few places for recreation exist and parks, squares, gyms, etc, for this reason can be harder to invest time to exercise, in addition to this if there are no sidewalks or walking site is not safe, then we have to always move in vehicles instead of walking. Genetics: Overweight and obesity can be hereditary, the odds of being overweight or being obese are greater if one or both of the parents are obese or overweight, research done with identical twins who grew up away from each other, they have shown that genes play a major role, moreover genes also influence in the way to store fat in the body.