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Like many other medical conditions, obesity is the result of an interplay between environmental and genetic factors. [2] [3] Studies have identified variants in several genes that may contribute to weight gain and body fat distribution, although only in a few cases are genes the primary cause of obesity.
An association between viruses and obesity has been found in humans, as well as a number of different animal species. The amount that these associations may have contributed to the rising rate of obesity is yet to be determined. [5] A fat virus is the popular name for the notion that some forms of obesity in humans and animals have a viral source.
Fat mass and obesity-associated protein, also known as alpha-ketoglutarate-dependent dioxygenase FTO, is an enzyme that in humans is encoded by the FTO gene located on chromosome 16. As one homolog in the AlkB family proteins, it is the first messenger RNA (mRNA) demethylase that has been identified. [ 5 ]
More than 2 in 5 adults in the U.S. have obesity, and rates of the condition have increased over time. But research has repeatedly found that obesity is a complicated disease, and for some, the ...
16p11.2 deletion syndrome is a rare genetic condition caused by microdeletion on the short arm of chromosome 16. Most affected individuals experience global developmental delay and intellectual disability, as well as childhood-onset obesity. [1] 16p11.2 deletion is estimated to account for approximately 1% of autism spectrum disorder cases. [3] [4]
Obesity has been observed throughout human history. Many early depictions of the human form in art and sculpture appear obese. [2] However, it was not until the 20th century that obesity became common — so much so that, in 1997, the World Health Organization (WHO) formally recognized obesity as a global epidemic [3] and estimated that the worldwide prevalence of obesity has nearly tripled ...
Obesity BMI. The National Heart, Lung, and Blood Institute defines obesity as a body mass index (BMI) of 30 or more. BMI is a measurement of body fat based on a person’s height and weight. An ...
For these people, obesity is a risk factor and should be addressed as such to reduce the risk of chronic conditions developing, but they do not yet have medical complications caused by obesity.