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Heredity plays a role in body shape and what a person weighs, so people from different races, ethnic groups, and nationalities tend to have different body fat distribution ratios. This means that different people will have a tendency to accumulate fat in different parts of their bodies or body composition, which is amounts of bone and muscle versus fat.
However, your genes are, though you are stuck with them, not your destiny. No matter whose genes you inherit, you can have a healthy body and keep your weight at a level that is normal for you by eating right and being active in a way that works for you. Genes are not the only things that family members may share — it is also true that unhealthy eating habits can be passed down.
The eating and exercise habits that you acquired from the people in the same household probably have an even greater effect than your genes on your individual risk of becoming overweight. If your family eats a lot of high-fat foods or snacks or does not get much exercise, you may tend to do the same, but the good news is these habits can be changed for the better. There's no time like the present, and you can start becoming healthier and fitter right away.
Even simple forms of exercise, such as walking, have huge benefits for a person’s health. It can be tough to deal with the physical changes our bodies go through during puberty, but at this time, more than any other, it is not a specific number on the scale that is important. It is more important to keep your body healthy, both inside and out.
BMI is between 18.5 and 24.9 when person is normal weight. People whose BMI is within 18.5 to 24.9 possess the ideal amount of body weight. It is associated with living longest, the lowest incidence of serious illness, as well as being perceived as more physically attractive people than persons with BMI in higher or lower ranges. It may be a good idea to check your waist circumference and keep it within the recommended limits.
Weight, in the context of human body weight measurements in the medical sciences and in sports is used interchangeably with mass. It is rather than the correct technical definition of weight, and is thus expressed in units of mass, such as kilograms, kg, or weight, such as pounds, lb. In Britain, the unit stone or equivalent to 14 lb or 6.35 kg is commonly used as well. The average weight for male adults in the United States is about 76 to 83 kg or 168 to 183 lb. The average weight for male teenagers in the United States is about 45 to 64 kg or 99 to 141 lb. For female adults the average weight is 54 to 64 kg or 120 to 141 lb. For female teenagers the average weight is 45 to 57 kg or 100 to 126 lb. Weight is, of course, related to height, so people taller than average tend to be heavier as well then others.