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Set point theory does not on its own explain why body mass index for humans, measured as a proxy for fat, tends to change with increasing age or why obesity levels in a population vary depending on socioeconomic or environmental factors (or why weight tends to change for an individual when socioeconomic status and environment change). [4]
One study found that 80% of the offspring of two obese parents were obese, in contrast to less than 10% of the offspring of two parents who were of normal weight. [ 30 ] The thrifty gene hypothesis postulates that due to dietary scarcity during human evolution people are prone to obesity.
Sellayah and colleagues have postulated an 'Out of Africa' theory to explain the evolutionary origins of obesity. The theory cites diverse ethnic based differences in obesity susceptibility in western civilizations to contend that, neither the thrifty or drifty gene hypotheses can explain the demographics of the modern obesity crisis.
An important link between genetics and obesity has just been discovered. Researchers from the University of British Columbia say by silencing a gene that codes for a certain protein, they cut fat ...
However, the proposed connection between a single gene and a single protein enzyme outlived the protein theory of gene structure. In a 1948 paper, Norman Horowitz named the concept the "one gene–one enzyme hypothesis". [2] Although influential, the one gene–one enzyme hypothesis was not unchallenged.
In one study, researchers told 10- to 12-year-olds all the genetic and medical factors that contribute to obesity. Afterward, the kids could recite back the message they received—fat kids didn’t get that way by choice—but they still had the same negative attitudes about the bigger kids sitting next to them.
For years, medical experts have defined obesity primarily based on body mass index, which measures stored fat by calculating height and weight, to determine a person’s health risks. Major public ...
The facial feedback hypothesis, rooted in the conjectures of Charles Darwin and William James, is that one's facial expression directly affects their emotional experience. . Specifically, physiological activation of the facial regions associated with certain emotions holds a direct effect on the elicitation of such emotional states, and the lack of or inhibition of facial activation will ...