Final answer:
Fast food availability contributes to obesity in adolescents due to the consumption of unhealthy and calorie-dense foods.
Step-by-step explanation:
Obesity is a common concern during adolescence and the availability of fast food is one of the reasons for obesity. Many teens eat too much food or unhealthy foods, and the rate of obesity in teenagers has tripled since 1980. Fast food restaurants often offer cheap and unhealthy options, which can contribute to weight gain and obesity. For example, these foods are often high in calories, unhealthy fats, and added sugars. Consuming these foods regularly can lead to weight gain and an increased risk of obesity.