The explanation is really simple, if you take more energy in the form of food than you use up you will gain weight there are, however, many factors that can influence this.
Genes determine how you body stores food and how well it turn food into energy in fat cells for tunes when food is scarce. but not all bodies are the same. your genes come from your parents, so overweight parents are more likely to have overweight children.
Although you may have good genes you still can become obese. one of the main causes of obesity is lack of physical exercise. An average child spends less time exercising than children did ten or twenty years ago. our free time activities have changed. instead of going outside and doing something physical children sit still for hours in front of computers, TV and video games.
so, what causes children obesity..??
firstly, snack and fast food. may of us eat meals a day thanks to excessive snacking. and when we have a snack we don't eat a carrot or an apple. instead we reach for junk food, but this is not always the children's fault. schools are full of vending machines that offer high calorie snacks and sugary soft drinks to make things worse they are bombarded with TV ads and commercials for unhealthy food. An average american eight-year old watches more than four thousand food ads a year about 35% of these ads are for candy and snacks, another 10% for fast food.fast food is another reason for obesity. while some fast food chains offer healthy alternatives, these aren't what people order. today's families also eat out a lot more than earlier generations.
Secondly, eating habits at home. if you develop healthy eating habits you will be more likely to keep a healthy weight. And it's at home where we form such habits. that you may have seen wrong eating habits your whole life. children who observe their parents eat a cookie instead pf piece of fruit, take their meals in front of the TV set or eat too quickly are more likely to do the same.
This increases their chances of becoming overweight children and later on adults.