1. what is one reason why the percentage of overweight teens has increased over the past 50 years
a. teenagers spend a lot more time outside
b. television commercials promote healthy food
c. there is more junk food and fast food available

2.bmi is a ratio of
a. height to body fat
b. weight to height
c. muscle mass to bone mass
d. weight to activity level

3. what is the best way for you to take care of yourself
a. participate in a variety of physical activities
b. worry about being physically perfect
c. eat more calories than you can burn
d. make yourself look like tv stars and models

1. One reason why the percentage of overweight teens has increased over the past 50 years is that there is more junk food and fast food available. C
In the past people eat much healthier and organic food. They prepared the food by themselves, and that food contained vitamins and minerals. The junk food is fast prepared food that lacks of vitamins.
2. BMI is a ratio of height to body fat. A . 
BMI stands for Body mass index .It is a parameter used  determine whether a person is in a healthy weight range for your height.
3. The best way for you to take care of yourself is to participate in a variety of physical activities. A
Physical activity has many benefits: it is good for emotional health-it makes you happier, it is good fr you physical health - your body but also it is good for your social life.