Final answer:
Adolescence is a period of life that encompasses puberty and the transition to adulthood. It is characterized by physical, mental, emotional, and social changes. Health concerns during this time include obesity, acne, and issues related to body image and self-esteem.
Step-by-step explanation:
Adolescence is the period of life between the start of puberty and the beginning of adulthood. It includes physical changes of puberty, as well as significant mental, emotional, and social changes. During this time, teenagers may experience various health concerns such as obesity, acne, and issues related to body image and self-esteem. Hormonal changes during adolescence can lead to overproduction of sebum, causing acne. Furthermore, many teenagers eat too much or unhealthy foods, leading to the high prevalence of obesity among this age group. Promoting healthy eating habits and regular exercise can help address these concerns.