TRUE if the statement expresses correct ideas and FALSE if it does not. 1. Underweight is a term used to describe a person whose body weight is considered too low to be heality. 2. A person is considered underweight if the Body Mass Index (BMI) is less than 18.5. 3. Obesity is defined as excessive fat in the body that presents a risk to health. 4. If the Body Mass Index (BMI) is 15% to 20% above normal for the age and height group, he or she is considered ght or obese mrsical activity to prevent obesity​