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Obesity is a condition in which excess body fat has accumulated to such an extent that it may have a negative effect on health. Medical organizations tend to classify people as obese based on body mass index (BMI) – a ratio of a person's weight in kilograms to the square of their height in meters.
There are three types of obesity: Class 1 (low-risk) obesity, if BMI is 30.0 to 34.9; Class 2 (moderate-risk) obesity, if BMI is 35.0 to 39.9; Class 3 (high-risk) obesity, if BMI is equal to or greater than 40.0.
The major contributors to obesity are: diet, sedentary lifestyle, genetics, other illnesses, social determinants, gut bacteria, and other factors.
Excessive body weight has a strong link to many diseases and conditions, particularly cardiovascular diseases, diabetes mellitus type 2, obstructive sleep apnea, certain types of cancer, osteoarthritis, and asthma. As a result, obesity has been found to reduce life expectancy.
Most of the world's population live in countries where overweight and obesity kills more people than underweight.
39 million children under the age of 5 were overweight or obese in 2020.
Worldwide obesity has nearly tripled since 1975.
From 1999-2000 through 2017-March 2020, US obesity prevalence increased from 30.5% to 41.9%.