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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.
The Harvard–MIT Program in Health Sciences and Technology (HST) is one of the oldest and largest biomedical engineering and physician-scientist training programs in the United States. It was founded in 1970 and is the longest-standing collaboration between Harvard University and the Massachusetts Institute of Technology (MIT).
Being overweight or having obesity may increase the risk of several diseases, such as diabetes, heart disease, and some cancers, and may lead to short- and long-term health problems during pregnancy. [2] Rates of obesity worldwide tripled from 1975 to 2016 to involve some 1.8 billion people and 39% of the world adult population. [3]
Diet, specifically the Western Pattern Diet, plays an important role in the genesis of obesity.Personal choices, food advertising, social customs and cultural influences, as well as food availability and pricing all play a role in determining what and how much an individual eats.
Obesity has become a common health problem. It affects about one in five children and two out of five adults in the U.S., according to the Centers for Disease Control and Prevention (CDC).
People do not swallow large numbers of spiders during sleep. A sleeping person makes noises that warn spiders of danger. [93] [94] Most people also wake up from sleep when they have a spider on their face. [95] A female Chinese mantis simultaneously copulating with and cannibalizing her mate; this does not occur every time mantises mate.
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 ...
This has been attributed to the fact that people often lose weight as they become progressively more ill. [91] Similar findings have been made in other types of heart disease. People with class I obesity and heart disease do not have greater rates of further heart problems than people of normal weight who also have heart disease.