People diagnosed as clinically obese are sometimes said to have a hormonal condition that makes them unable to lose weight even if they cut calorie intake to a minimum. Surely if you forced them to exercise while making certain their dietary intake and vital signs were healthy, they'd be slim and trim in a couple years. In the end, isn't obesity always in the mind and not in the hormones? -- Guy Scarsbrook
There's no denying your main point: people lose weight when they burn more calories than they consume. It's the first law of thermodynamics-no matter what you hear about low calorie intake leading to metabolic shutdown, energy must be conserved.
The problem is your assumption that a medical condition is just an excuse. Sometimes it might be. But not always. Many medical problems can lead to weight gain, and some of these can legitimately be described as hormonal conditions. One relatively common example is hypothyroidism, which afflicts about five percent of the population. Essentially your metabolism slows down, meaning you're not converting enough food into energy-fatigue is a frequent symptom. You become less active, and assuming your eating habits stay the same, you gain weight.
Polycystic ovarian syndrome, or PCOS, which affects seven percent of women, can lead to weight gain. Many women with PCOS are insulin-resistant: their cells don't absorb glucose as readily as they used to, and the excess is stored as fat. Insulin resistance, which can lead to diabetes, is a common problem linked to obesity.
But it's simplistic to say insulin resistance makes you fat. On the contrary, resistance is thought to be the effect rather than the cause of weight gain.
After that, relevant hormonal conditions get scarce pretty fast. Cushing's syndrome, caused by abnormally high levels of the hormone cortisol, can lead to specific types of weight gain including a round "moon face" or a "buffalo hump" of fat on the neck and upper back, but fortunately it's rare. Human growth hormone deficiency may result in increased body fat, but that's rare.
Sometimes medications can lead to weight gain. For example, about half of schizophrenic patients and two-thirds of bipolar disorder sufferers are obese due to a combination of illness-related factors and side effects from their antipsychotic medications. Depression can lead to obesity, and so can antidepressants, many of which list weight gain among possible side effects. Those who take corticosteroids for asthma or other problems can put on weight as well. If these people stopped taking the problematic medication I guess they could lose weight, but which would you rather be, fat and happy or thin and sick?
Is obesity genetic? Maybe in part. Research suggests 16 percent of the population has a version of the fat-mass- and obesity-associated gene, known as FTO, that increases one's propensity to put on the pounds. However, the amount of extra weight attributable to this gene is small, just seven pounds on average.
Likewise, a few overweight folks have problems with leptin receptor genes, which can lead to early obesity by suppressing signals that tell the body it's had enough to eat. Roughly ten percent of us have an insulin-affecting gene that increases the risk of obesity.
Still, most serious students of the obesity epidemic are lining up with you, Guy: too much shoveled in, not enough burned off. Nowadays it's easy to get fat-all you have to do is eat what's put in front of you. The percentage of meals eaten away from home has doubled since 1978; during the same period, restaurant portions have been supersized and average U.S. food intake has increased by 200 calories per day.
In one particularly appalling study from 2006, 193 consumers were asked to estimate, among other things, the calorie content of an order of cheese fries with ranch dressing. Average guess: 869 calories. Actual damage: 3,010 calories.
Today, one U.S. adult in three is obese, more than double the rate in 1980. You can't blame hormones.
Do we chalk it up to the American public's pathetic lack of willpower? My inner puritan says yes. However, there's no question that the masses are being hammered by a relentless outside force, namely the ever-present voice asking, "You want fries with that?"
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