Final answer:
An overweight BMI ranges from 25 to 29.9, while obesity is defined as a BMI of 30 or higher. Both conditions increase the risk of various diseases, but the BMI measure has limitations and is best used alongside other health assessments.
Step-by-step explanation:
An overweight Body Mass Index (BMI) is defined as a BMI between 25 and 29.9. An individual with a BMI of 30 or higher is considered to have obesity. The greater severity of excessive body weight, known as morbid obesity, is diagnosed with a BMI over 40 or a BMI over 35 with obesity-related health complications. Those with an overweight BMI are at an increased risk of developing health issues such as type 2 diabetes, high blood pressure, heart disease, and certain cancers. Obesity carries an even higher risk for these conditions and can also lead to complications such as stroke, liver disease, sleep apnea, infertility, and osteoarthritis. It's important to note that BMI is a tool used to screen for potential health problems in populations, but it should be paired with other assessments for individuals as it doesn't distinguish between fat and muscle mass.