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Adolescence represents a period of transition between childhood and adulthood when adequate nutrition is required for growth and maturation. However, adolescence is also a time for children to assert their independence in matters of food choice, sometimes leading to poor diets. Survey data reveal low intakes of key vitamins and minerals in subgroups of adolescents, particularly girls. Iron, calcium, folate, and long-chain ω-3 fatty acids are all nutrients of concern in this age group. Intakes of saturated fat, salt, and added sugars tend to be higher than recommended levels. The impact of food choice and lifestyle on diet adequacy is discussed.