What is obesity?
Obesity is best defined by using the body mass index. The body mass index is calculated using a person's height and weight. The body mass index (BMI) equals a person's weight in kilograms (kg) divided by their height in meters (m) squared. Since BMI describes body weight relative to height, it is strongly correlated with total body fat content in adults. An adult who has a BMI of 25-29.9 is considered overweight, and an adult who has a BMI over 30 is considered obese.
Surprising Reasons You're Gaining Weight
f you started taking in more calories than usual or cutting back on exercise, you wouldn't be surprised if the numbers on the scale crept higher. But what if you're doing everything the same as you always do and your weight still goes up? It's time to delve a little deeper into what else might be going on.Lack of Sleep
There are two issues at work with sleep and weight gain. The first is intuitive: If you're up late, the odds are greater that you're doing some late-night snacking, which will increase your calorie intake. The other reason involves what's going on biochemically when you're sleep deprived. Changes in hormone levels increase hunger and appetite and also make you feel not as full after eating.Stress
When life's demands get too intense, our bodies go into survival mode: Cortisol, the "stress hormone," is secreted, which causes an increase in appetite. And then of course, we may reach for high-calorie comfort foods in times of stress as well. This combination is a perfect breeding ground for weight gain.Antidepressants
An unfortunate side effect from some antidepressants is weight gain, which may occur in up to 25% of people taking them long-term. Talk to your doctor about switching to another drug if you think your antidepressant is causing weight gain. But realize that some people experience weight gain after beginning drug treatment simply because they're feeling better, which leads to a better appetite. Also, depression itself can cause changes in weight.Don't Blame Menopause
Don't blame menopause and the loss of estrogen for your midlife weight gain. These may occur around the same time, during your 40s or 50s, but changing hormone levels probably aren't the cause. Aging slows the metabolism, so you burn fewer calories, and changes in lifestyle (such as exercising less) play a role. But where you gain weight may be related to menopause, with fat accumulatingQuitting Smoking
On average, people who stop smoking gain less than 10 pounds. Why? Because without nicotine you may:- Feel hungrier and eat more (this feeling should go away after several weeks)
- Experience a decrease in your metabolism, without reducing your calorie intake
- Find food tastes better, which may lead to overeating
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If You Do Gain Weight ...
Don't compare yourself to other people taking the same drug. Not all people experience the same side effects on the same drug. Even if one drug caused someone else to lose weight, the same might not be true for you. Consult your doctor
Conclusion
What are other factors associated with obesity?
- Ethnicity. Ethnicity factors may influence the age of onset and the rapidity of weight gain. African-American women and Hispanic women tend to experience weight gain earlier in life than Caucasians and Asians, and age-adjusted obesity rates are higher in these groups. Non-Hispanic black men and Hispanic men have a higher obesity rate then non-Hispanic white men, but the difference in prevalence is significantly less than in women.
- Childhood weight. A person's weight during childhood, the teenage
years, and early adulthood may also influence the development of adult obesity.
For example,
- being mildly overweight in the early 20s was linked to a substantial incidence of obesity by age 35;
- being overweight during older childhood is highly predictive of adult obesity, especially if a parent is also obese;
- being overweight during the teenage years is even a greater predictor of adult obesity.
- Hormones. Women tend to gain weight especially during certain events such as pregnancy, menopause, and in some cases, with the use of oral contraceptives. However, with the availability of the lower-dose estrogen pills, weight gain has not been as great a risk.
What can be done about obesity?
We need to learn more about the causes of obesity, and then we need to change the ways we treat it. When obesity is accepted as a chronic disease, it will be treated like other chronic diseases such as diabetes and high blood pressure. The treatment of obesity cannot be a short-term "fix" but has to be an ongoing lifelong process.
Obesity treatment must acknowledge that even modest weight loss can be beneficial. For example, a modest weight loss of 5%-10% of the initial weight, and long-term maintenance of that weight loss can bring significant health gains, including- lowered blood pressure;
- reduced blood levels of cholesterol;
- reduced risk of type 2 (adult-onset) diabetes (In the Nurses Health Study, women who lost 5 kilograms (11 pounds) of weight reduced their risk of diabetes by 50% or more.);
- decreased chance of stroke;
- decreased complications of heart disease;
- decreased overall mortality.
In sum, the goal in dealing with obesity is to achieve and maintain a "healthier weight."
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