"Morbid obesity increases the risk for mortality. The above study demonstrates that in patients being treated with bariatric surgery, the risk of 5-year mortality is reduced by 89%. This is a signiﬁcant observation since it not only suggests the role of morbidity as a risk factor for early mortality, but also provides evidence that surgical treatment for obesity produces a signiﬁcant reduction in mortality."
Researchers have divided eating into two categories, which are important to understand: 1) 'homeostatic eating', in which food intake is driven by a true need for energy, and 2) 'non-homeostatic eating', in which food intake is driven by other factors. Eating in response to hunger is mostly homeostatic, while eating for pleasure, emotional/stress reasons, social reasons, or just because it's mealtime, is non-homeostatic.
A common sense example is all we need to begin to understand this. The holiday season is the scenario in which Americans are most likely to overeat and gain fat. That's not because we're suddenly hungrier on Thanksgiving-- holiday weight gain is driven almost exclusively by non-homeostatic overeating: the presence of readily accessible, delicious, energy-dense, diverse food, and social eating and drinking. The average American overeats during the holidays, gains fat, and hangs on to most of it indefinitely. ...
Holiday weight gain accounts for about half of total annual weight gain in American adults, and is therefore an excellent example of non-homeostatic overeating leading to weight gain (5).
Another example of non-homeostatic eating is soda consumption. People don't choose calorie-dense soda over plain water because they're hungry or thirsty-- they choose it because they like soda. Most people only weakly compensate for the extra calories they drink by eating less later.
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