Final answer:
Obesity is defined as an excess of body weight by about 20% over the individual's ideal body weight, and it is measured with a BMI greater than 30 kg/m². It has various health risks and contributory factors, but it can often be managed through lifestyle changes.
Step-by-step explanation:
Obesity occurs when someone's body weight exceeds his or her desired body weight for height by approximately 20%. Obesity is a health condition where excess body fat has accumulated to the extent that it may negatively affect an individual's health. It is typically measured using the body mass index (BMI), where a BMI greater than 30 kg/m² is considered obese. Obesity is linked to various health issues such as type 2 diabetes, hypertension, and certain types of cancer. Factors contributing to obesity include overeating, poor diet, sedentary lifestyle, inadequate sleep, genetics, and sometimes diseases or medications. Addressing obesity often involves lifestyle changes and interventions to reduce weight and improve health outcomes.