Adolescence /ˌæd

muscle /ˈmʌs.l ̩/ noun BODY PART
1. [ C or U ] one of many tissues in the body that can tighten and relax to produce movement
neck/back/leg/stomach muscles facial muscles
bulging/rippling (= large and clear to see) muscles
He flexed his muscles (= tightened, especially his arm muscles, to make them look large and strong) so that everyone could admire them.
These exercises build muscle and increase stamina.
a muscle spasm (= a sudden uncontrollable tightening movement)
2. pull a muscle
to injure a muscle by stretching it too far so that it is very painful
Russell pulled a back muscle early in the game.
nutrient /ˈnjuː.tri. ə nt/ /ˈnuː-/ noun [ C ] specialized
any substance which plants or animals need in order to live and grow
It's good soil - full of nutrients.
A healthy diet should provide all your essential nutrients.
nutrition /njuːˈtrɪʃ. ə n/ /nuː-/ noun [ U ]
1. the substances that you take into your body as food and the way that they influence your health
Good nutrition is essential if patients are to make a quick recovery.
improvements in nutrition
2. the process of taking in and using food, or the scientific study of this
She's a professor of nutrition at Columbia University.
obesity /ə ʊ  ˈbiː.sɪ.ti/ /oʊˈbiː.sə.t ̬i/ noun [ U ]
childhood obesity
A diet that is high in fat can lead to obesity.