Kids who drink sugary sodas and eat high-calorie, processed foods develop a taste for these products and continue eating them as adults, which tends to promote weight gain. A typical serving of French fries from McDonald's contains three times more calories than when the franchise began. Our daily lives don't offer many opportunities for activity. Both can affect your physiology such as how fast you burn calories as well as your behavior the types of foods you choose to eat, for instance. Genetic influences To date, more than different genes have been implicated in the causes of overweight or obesity, although only a handful appear to be major players. A single "super-sized" meal may contain 1,—2, calories — all the calories that most people need for an entire day. After birth, babies who are breast-fed for more than three months are less likely to have obesity as adolescents compared with infants who are breast-fed for less than three months.
International Journal of Obesity, 42, — In fact, a study that limited the amount of TV kids watched demonstrated that this practice helped them lose weight — but not because they became more active when they weren't watching TV. At the other extreme are people who seem to gain weight no matter how little they eat. An estimation of adult human biomass. Sedentary snacking The average American watches about four hours of television per day, a habit that's been linked to overweight or obesity in a number of studies. The average hour-long TV show features about 11 food and beverage commercials, which encourage people to eat. The exercise equation The government's current recommendations for exercise call for an hour of moderate to vigorous exercise a day. Fat isn't necessarily the problem; in fact, research shows that the fat content of our diet has actually gone down since the early s. Taken together, experts think that environmental factors are the driving force for the dramatic increase in obesity. Some researchers also think that the very act of eating irregularly and on the run may contribute to obesity. Neurological evidence indicates that the brain's biological clock — the pacemaker that controls numerous other daily rhythms in our bodies — may also help to regulate hunger and satiety signals. Kids who drink sugary sodas and eat high-calorie, processed foods develop a taste for these products and continue eating them as adults, which tends to promote weight gain. For example, these days it's commonplace to work long hours and take shorter or less frequent vacations. In turn, overweight and obesity themselves can promote emotional disorders: Between and , the average man added calories to his daily fare, while the average woman added calories a day. Mayo Clinic Proceedings, 86 6 , A typical serving of French fries from McDonald's contains three times more calories than when the franchise began. Journal of Obesity, People with only a moderate genetic predisposition to be overweight have a good chance of losing weight on their own by eating fewer calories and getting more vigorous exercise more often. Instead of walking to local shops and toting shopping bags, we drive to one-stop megastores, where we park close to the entrance, wheel our purchases in a shopping cart, and drive home. Genes alone cannot possibly explain such a rapid rise. But each of these factors is influenced by a combination of genes and environment. The strength of the genetic influence on weight disorders varies quite a bit from person to person. Sports Health, 3 3 , — The utility of body mass index BMI , percent body fat, and leptin.
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