World Obesity 2023 is a medical condition in which has accumulated to the extent that it may have a negative effect on health, leading to reduced life expectancy and/or increased health problems. In Western countries, people are considered obese when their Body Mass Index (BMI), a measurement obtained by dividing a person's weight by the square of the person's height, exceeds 30 kg/m2, with the range 25-30 kg/m2 defined as overweight. In earlier historical periods obesity was rare, and achievable only by the small elite, although already recognized as a problem for health. But as prosperity increased in the Early Modern period, it affected increasingly larger groups of the population. In 1997 the WHO formally recognized obesity as a global epidemic. As of 2008, the WHO estimates that at least 500 million adults (greater than 10%) are obese, with higher rates among women than men. The rate of obesity also increases with age at least up to 50 or 60 years old and severe Obesity in the United States, Australia, and Canada is increasing faster than the overall rate of obesity.

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