Abstract
Adolescence, the period between childhood and adulthood, is a time when significant changes happen to the human body. These changes, called puberty, signify the time during which humans develop into adults. During puberty, changes in weight, height, and muscle size leave many adolescents feeling unhappy with their appearance. We describe how these changes affect body image, which is the way that adolescents feel about their bodies. First, we discuss how a negative body image can be a risk factor for eating disorders and depression. Second, we highlight the body positivity movement, which encourages people to love their bodies no matter what they look like. Lastly, we describe body neutrality, an attitude that celebrates bodies for what they allow us to do, rather than for their appearance. Together, these body image concepts can help people to understand how physical changes that accompany puberty might affect mental health.
What is Body Image?
Body image
Physical Changes During Puberty
Puberty leads to two main physical changes: height and weight gain; and growth of secondary sex characteristics
During puberty, people experience changes in their body proportions. Girls grow about 3.5 inches per year, while boys grow about 4 inches per year [1]. Girls typically experience this growth spurt 2 years earlier than boys, who “catch up” around age 14 [1]. The head, hands, and feet are among the first body parts to grow, followed by the arms, legs, chest, and shoulders. On average, people also gain half of their adult body weight during adolescence [2]. In boys, weight gain is about 75% muscle and 25% body fat, while in girls, weight gain is about 55% body fat and 45% muscle [2].
Puberty also includes the development of secondary sex characteristics, or parts of the body that are not directly required for reproduction [1]. While every adolescent experiences these changes, the age of onset and pace differ from person to person. Girls develop hips and breasts, whereas boys develop a bump on the throat called the Adam’s apple. Both girls and boys start growing thicker, darker hair between their legs and in their armpits. Boys also grow hair on their faces and chests, and their voices deepen. During puberty, glands in the skin produce more oil, causing acne. Although all these changes are normal, they can have a big impact on an adolescent’s body image.
Types of Body Image
During puberty, a person’s body image may change. Below, we compare three types of feelings that someone could have about the ways in which their body is developing (Figure 1).

- Figure 1 - Types of body image that adolescents may experience during puberty.
Body Dissatisfaction
With all the ways the body changes, adolescents may struggle to accept their new appearance. When someone does not like something about their body or appearance, it is called a negative body image, or body dissatisfaction
Body Positivity
When someone likes something about the way their body looks, it is called a positive body image, or body positivity
Compared to girls, boys generally have more body positivity during puberty. During puberty, boys can build muscle easier than ever before, and they are often happy to grow a few inches taller [1]. Boys who go through puberty earlier than their friends are especially likely to feel body positivity. Girls can also feel good about the changes happening to their bodies. For example, some girls might like the curves and strength they gain. For boys and girls, changes that happen during puberty can help with athletics and sports, which may increase their popularity.
Body Neutrality
So far, we have talked about two kinds of body image: body negativity and body positivity. These types of body image refer to the way someone feels about their looks. However, there is much more to the body than its appearance! Body neutrality
Why Does Body Image Matter?
How adolescents think and feel about their bodies has a large impact on their mental health. As we mentioned before, many adolescents become unhappy or feel out of control when their bodies start changing, and body dissatisfaction is usually at its highest during puberty. Yet, when adolescents feel good about their bodies, they often have better self-esteem and overall well-being. Therefore, it is important to understand the negative things that might happen when young people struggle with body dissatisfaction, so that we can help them by learning ways to promote a healthy and positive body image.
Because body image is related to mood, young people are at a higher risk for eating disorders
Even when a person does not develop an eating disorder, they still may feel like they will never be happy with how they look, and their self-esteem can be impacted. They might become more self-critical and feel hopeless that things will never change. It is easy to see how this could lead someone to be in a bad mood most of the time! Therefore, combatting body dissatisfaction is critical during adolescence. Promoting body positivity and body neutrality can improve young people’s mental health and emotional well-being. Fostering a healthy body image empowers adolescents to embrace the changes happening to their bodies with confidence, improving mood and supporting a more positive mindset. If you or someone you know is struggling with negative feelings about their body, eating, or low mood, it is important to consult with a trusted adult who can help find helpful support and resources. To start, we recommend checking the National Eating Disorders Association’s website.
Understanding Body Image Changes During Puberty
Body image is a key concept when it comes to understanding and navigating adolescence. Puberty is a time of huge physical changes, which can lead young people to evaluate themselves based on how they look. How people think about their bodies is directly related to their mental health. Body dissatisfaction may put people at greater risk of struggling with eating and exercise or with depression. Sometimes, having a more positive body image allows people to love their bodies despite all the changes! Alternatively, a more neutral focus on the function of the body can help adolescents appreciate how their bodies allow them to do all of the activities that make life so fun. Together, no matter how adolescents feel about their bodies, an understanding of the types of body image and how they arise can provide a helpful framework for understanding some of the challenges of puberty.
Glossary
Body Image: ↑ How someone feels about their body or their appearance.
Adolescence: ↑ The period between childhood and adulthood that spans roughly ages 10–19.
Puberty: ↑ A biological process that normally starts in adolescence, when hormonal changes allow a person to become sexually mature.
Secondary Sex Characteristics: ↑ Parts of the body that develop during puberty that are not directly required for reproduction, such as breasts, hips, and facial hair.
Body Dissatisfaction: ↑ When someone holds negative thoughts about their body or appearance.
Body Positivity: ↑ When someone holds a positive view of their body, regardless of size, shape, or other physical characteristics.
Body Neutrality: ↑ When someone appreciates what their body allows them to do, no matter what it looks like.
Eating Disorders: ↑ Serious mental health conditions where people have unhealthy thoughts, feelings, and behaviors about food and their bodies.
Conflict of Interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
References
[1] ↑ Steinberg, L. 2020. “Puberty: an overview”, in Adolescence, 12th Edn (New York, NY: McGraw-Hill Education). p. 16–27.
[2] ↑ Susman, E. J., and Dorn, L. D. 2013. “Puberty: its role in development”, in Handbook of Psychology: Developmental Psychology, Vol. 6, 2nd Edn, eds. J. Mistry, M. A. Easterbrooks, and R. M. Lerner (Hoboken, NJ: John Wiley & Sons, Inc.). p. 289–320.
[3] ↑ Calzo, J. P., Sonneville, K. R., Haines, J., Blood, E. A., Field, A. E., and Austin, S. B. 2012. The development of associations among body mass index, body dissatisfaction, and weight and shape concern in adolescent boys and girls. J. Adolesc. Health Off. Publ. Soc. Adolesc. Med. 51:517–23. doi: 10.1016/j.jadohealth.2012.02.021
[4] ↑ Webb, H. J., and Zimmer-Gembeck, M. J. 2014. The role of friends and peers in adolescent body dissatisfaction: a review and critique of 15 years of research. J. Res. Adolesc. 24:564–90. doi: 10.1111/jora.12084
[5] ↑ Cohen, R., Newton-John, T., and Slater, A. 2020. The case for body positivity on social media: perspectives on current advances and future directions. J. Health Psychol. 26:2365–73. doi: 10.1177/1359105320912450