According to the World Health Organization, a BMI, or body mass index is a ratio of weight to height, greater than 25 is believed overweight

It is believed 340,000 cases of cancer could be prevented annually in the United States alone, if more people made an effort to keep their weight down, exercised and drank less alcohol and ate healthier. Overweight people are understood to be at a higher risk for a number of so-called 慺at cancers? including breast and colon cancer.

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Three studies, published in The Lancet, indicated that while high-income western countries, such as Canada, have rising obesity in almost every region of the globe, while lowering total cholesterol and blood-pressure levels. The reports track country-by-country trends for three major factors that caused heart disease across three decades.

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With more than half a billion adults now considered to be obese in 2008, obesity has nearly doubled since 1980. Overall, people have been gaining weight at a rate of 2.5 to three pounds per person every ten years. Canadian women are growing to be overweight faster than any other females in the high-income world. It records some of the highest average body mass indexes among wealthy nations ?even though it's still inferior to the heavyweight champion, the United States. According to the World Health Organization, a BMI, or body mass index is a ratio of weight to height, greater than 25 is believed overweight. One thing is clear, according to the researchers; simple advice and exercise alone aren't working. Dr. Arya Sharma, scientific director of the Canadian Obesity Network said "It will take decades to reverse the obesity epidemic". Ph.D., Frederick J. Zimmerman, an economist and professor of health services at the UCLA School of Public Health discovered that the number of commercials people are watching is more closely connected to the hazard of being overweight, than the total time spent viewing television. Doctors Sonia Anand and Salim Yusuf, two McMaster University experts in population health said, "Being overweight affects one in three adults and obesity affects one in nine adults in the world ?a tsunami of obesity that will eventually affect all regions of the world". Zimmerman thinks the real culprit behind the obesity epidemic isn't corn syrup, or high-fructose sodium, per se, or saturated fat, but rather the omnipresent marketing methods that makes foods containing those ingredients so appealing. "We often aks why is obesity bad? Because it increases other risk factors for things like heart disease and, in some cases, cancer, yet despite the increase (in BMI) we are able somehow to control the blood pressure and cholesterol." McMaster's team said, "The forecast for the next few decades is dismal and comprises a population emergency that will cost tens of millions of preventable deaths, unless rapid and widespread actions are taken by governments and health care systems worldwide". The power of advertising has largely produced a negative effect on our health, but in theory that power could be harnessed for good, Jonathan H. Whiteson, M.D. says.