Obesity is generally defined using a body mass index score, known as a BMI. This uses your height to determine your ideal weight and scores you on where you fall on the scale - anything above 25 is considered overweight.
However, the BMI scale has come under fire for being an inaccurate measurement of appropriate weight, with detractors arguing that this does not take into account muscle gain or body shape, and it's not advised to use this as a sole measurement of health.
Obesity develops gradually, and is caused by a number of different factors, including but not limited to:
Obesity is linked to a number of long-term problems, such as high blood pressure and high cholesterol. This is because the arteries are under more strain, and both can lead to heart disease and stroke if the body is not looked after.
Type 2 diabetes is also linked to obesity, with over half of all cases being directly attributed to a high BMI.
Popular social stigma associates weight with health, a phenomenon which in itself is harmful to those who are overweight.
People can often develop low self-esteem and a feeling of isolation, and mental health issues such as depression can occur - which in turn can exacerbate the issue.
Modern body-positive movements have tackled this side of living with obesity by creating a culture of self-acceptance, encouraging people to appreciate and look after their bodies more at every size.
They also create a supportive community and foster a positive attitude which aids mental wellbeing and counters the stigma that many obese people face.
To learn more about the treatment of obesity, take a look at the different options outlined by the NHS. Calorie-controlled diets are considered the most effective, but a doctor may be able to recommend other methods.