there are also some risk factors that contribute to this.

It’s Genetics. According to Wikipedia, Genetics is the study
of genes, genetic variation, and heredity in living organisms. It is
generally considered a field of biology, but intersects
frequently with many other life sciences and is
strongly linked with the study of information systems. It is believed that when saying about the causes of
obesity, we must include the role of genetics as well as the environment around

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    ” Obesity
risk is two to eight times higher for a person with a family history as opposed
to a person with no family history of obesity, and an even higher risk is
observed in cases of severe obesity ”  (http://www.obesity.ulaval.ca/obesity/generalities/genetic.php )

This means, when being born in a family with
parents who are obesity or overweight, the chance of being overweight will
increase compared with person was born in a healthy family. Moreover, heredity
will also strongly affect on your weight and where you carry it.

Secondly, they’re medical problems and certain
medication. Some medical cause, such as Prader-Willi syndrome, Cushing’s
syndrome and other conditions can be the reason of obesity. Arthritis, a
medical problem, which lead to decreased activity, may result in weight gain.
In addition, some medications will lead to obesity if you don’t adjust through
diet or activities such as diabetes medications.

After that, the reasons that lead to obesity can
be really normal like quitting smoking or lack of sleep. Giving up smoking is
often associated with weight gain. Once you begin to quit it, your appetite
will be changed too.However, quitting smoking is still better than continuing
to smoke. Some researchers have shown that not getting enough sleep or too much
sleep can cause changes in hormones that increase you taste.

Even if you have one or more of these risk
factors, it doesn’t mean that you’re obese. You can adjust it by exercising and
through diet.

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