Give me a really detailed explianation of what obesity actually is thanks?!

Obesity is a condition in which the natural energy reserve, stored in the fatty tissue of humans and other mammals, exceeds healthy limits!. It is commonly defined as a body mass index (weight divided by height squared) of 30 kg/m2 or higher!.

Although obesity is an individual clinical condition, some authorities view it as a serious and growing public health problem!. Some studies show that excessive body weight has been shown to predispose to various diseases, particularly cardiovascular diseases, diabetes mellitus type 2, sleep apnea and osteoarthritis!.[1][2]

Contents [hide]
1 Classification
1!.1 BMI
1!.2 Waist circumference
1!.3 Body fat measurement
1!.4 Risk factors and comorbidities
2 Effects on health
3 Causes and mechanisms
3!.1 Lifestyle
3!.2 Genetics
3!.3 Medical illness
3!.4 Neurobiological mechanisms
3!.5 Microbiological aspects
3!.6 Social determinants
4 Treatment
4!.1 Clinical protocols
4!.2 Exercise
4!.3 Dieting
4!.3!.1 Low carbohydrate versus low fat
4!.3!.2 Low glycemic index
4!.4 Drugs
4!.5 Bariatric surgery
4!.6 Counseling
5 Cultural and social significance
5!.1 Etymology
5!.2 History
5!.3 Contemporary culture
5!.4 Popular culture
6 Public health and policy
6!.1 Prevalence
6!.2 Environmental factors
6!.3 Public health and policy responses
6!.4 Non-medical consequences
7 See also
8 References
9 External links



Classification
Obesity can be defined in absolute or relative terms!. In practical settings, obesity is typically evaluated in absolute terms by measuring BMI (body mass index), but also in terms of its distribution through waist circumference or waist-hip circumference ratio measurements!.[3] In addition, the presence of obesity needs to be regarded in the context of other risk factors and comorbidities (other medical conditions that could influence risk of complications)!.[1]


BMI
BMI, or body mass index, is a simple and widely used method for estimating body fat!.[4] BMI was developed by the Belgian statistician and anthropometrist Adolphe Quetelet!.[5] It is calculated by dividing the subject's weight by the square of his/her height, typically expressed either in metric or US "Customary" units:

Metric: BMI = kg / m2
Where kg is the subject's weight in kilograms and m is the subject's height in metres!.

US/Customary: BMI = lb * 703 / in2
Where lb is the subject's weight in pounds and in is the subject's height in inches!.

The most commonly used definitions, established by the WHO in 1997 and published in 2000, provide the following values:[6]

A BMI less than 18!.5 is underweight
A BMI of 18!.5

---

---