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POCKET GUIDE - Bright Futures - American Academy of Pediatrics

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■■ adolesCenCe<br />

oVerView<br />

Adolescence is a period <strong>of</strong> dramatic physical, cognitive, social,<br />

and emotional changes. This developmental period is divided<br />

into 3 stages.<br />

Early adolescence (ages 11–14). Adolescents are characterized<br />

by pubertal changes and a growing capacity for abstract<br />

thought, although concrete and oriented toward the present.<br />

Middle adolescence (ages 15–17). Adolescents are characterized<br />

by independence, experimentation, future-oriented<br />

thinking, and problem-solving abilities.<br />

Late adolescence (ages 18–21). This stage is a time <strong>of</strong> important<br />

personal and vocational decisions and refined abilities to<br />

reason logically and solve problems.<br />

growth and Development<br />

■ Adolescents achieve the final 15% to 20% <strong>of</strong> their adult<br />

height and gain 50% <strong>of</strong> their adult weight.<br />

■ Adolescents accumulate up to 40% <strong>of</strong> their skeletal mass.<br />

■ Nutrient needs are greatest during peak periods <strong>of</strong><br />

growth (sexual maturity rating [sMr] 2–3 in females,<br />

3–4 in males).<br />

■ Females complete most physical growth about 2 years after<br />

menarche. Mean age <strong>of</strong> menarche is 12.5 years.<br />

■ Males begin puberty about 2 years later than females.<br />

■ Males experience major growth spurts and increases in<br />

muscle mass during middle adolescence.<br />

■ Cognitive capacities increase dramatically during<br />

adolescence.<br />

■ Developing an identity and becoming an independent<br />

young adult are central to adolescence.<br />

eating<br />

■ Foods can have symbolic meanings. Adolescents may use<br />

them to establish individuality and express their identity.<br />

■ Adolescents may adopt certain eating behaviors (such<br />

as vegetarianism) to explore various lifestyles or to show<br />

concern for the environment.<br />

■ interest in new foods, including those from different cultures<br />

and ethnic groups, is common during adolescence.<br />

■ Adolescents spend more time away from home and eat<br />

more meals and snacks away from home than when they<br />

were younger. Many adolescents go to stores and fast-food<br />

restaurants and purchase food with their own money.<br />

45<br />

<strong>Bright</strong> FUTURES<br />

Adolescence

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