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Obesity is a complex disease involving an excessive amount of body fat [1]. It is defined as too much body fat and can put your health at risk [6]. Body Mass Index (BMI) is a tool that can screen for overweight or obesity [6]. Overweight and obesity are defined as abnormal or excessive fat accumulation that presents a risk to health [3][ 5] and may impair health [5]. CDC's Overweight and Obesity efforts focus on policy and environmental changes to help people make healthier choices easier in their everyday lives [2], while The Obesity Society focuses on advancing the science-based understanding of the causes, consequences, prevention, and treatment of obesity through research, education, advocacy, public awareness programs, evidence-based clinical practice guidelines for healthcare professionals treating patients with obesity. 

[1]: Obesity - Symptoms and causes - Mayo Clinic (
[2]: Overweight & Obesity | CDC (
[3]: Obesity (
[4]: Adult Obesity Facts | Overweight & Obesity | CDC (
[5]: Obesity and overweight (
[6]: Obesity (Excessively Overweight): Health Effects and Next Steps (


Obesity is a medical condition in which excess body fat has accumulated to the extent that it may have an adverse effect on health, leading to reduced life expectancy and/or increased health problems. It is most commonly caused by a combination of excessive food intake, lack of physical activity, and genetic susceptibility. Obesity increases the likelihood of various diseases and conditions, particularly cardiovascular diseases, type 2 diabetes mellitus (T2DM), obstructive sleep apnea (OSA), certain types of cancer, osteoarthritis and depression. Health risks increase significantly with higher levels of obesity. The World Health Organization (WHO) estimates that overweight and obesity were the fifth leading risk for global deaths in 2020 with approximately 2.8 million people dying as a result each year.