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Teen Girls Nutrition Guide: Micronutrients for Growth & Puberty
From iron and calcium to protein, vitamin D, zinc and healthy eating habits—what parents should know about feeding girls through puberty and adolescence.
Key Evidence Takeaways:
- Adolescence is a period of rapid physical growth — up to 90% of adult peak bone mass is accumulated by age 18.
- Once menstruation begins, iron requirements jump significantly (the U.S. RDA rises to 15 mg/day for females ages 14–18).
- The 2025 Dietary Guidelines Advisory Committee scientific report found 86% of U.S. females ages 14–18 had calcium intakes below Estimated Average Requirements.
- Your role as a parent gradually shifts from controlling the plate at five to teaching her why choices matter at fifteen.
- Focus on health, strength, energy, and joyful eating — avoid labeling foods as "good" or "bad" or encouraging restrictive diets.
Frequently Asked Questions
What nutrients are most important for teenage girls?
Iron, calcium, vitamin D, zinc and protein are among the nutrients parents should pay attention to during adolescence. A varied eating pattern is generally more useful than focusing on individual supplements.
How much iron does a teenage girl need?
The RDA for girls ages 14–18 is 15 mg of iron per day. Menstruation increases iron requirements, making iron particularly important once periods begin.
How much calcium does a teenage girl need?
The recommended intake for girls ages 9–18 is 1,300 mg per day. Calcium is especially important during adolescence because significant bone development occurs during these years.
Should teenage girls take a multivitamin?
Not automatically. Many teenagers can obtain needed nutrients from a varied diet. Supplements may be appropriate in certain circumstances, such as a diagnosed deficiency, restrictive diet or specific medical recommendation.
Should parents give teenage girls iron supplements?
Don't automatically give iron because your daughter seems tired. Iron supplementation should be based on dietary assessment, clinical circumstances and, when appropriate, professional evaluation.
What if my daughter doesn't drink milk?
That's not necessarily a problem. Look for other calcium sources, including yogurt, cheese, calcium-fortified plant beverages and other calcium-rich foods.
Can teenage girls be vegetarian or vegan?
Yes, but the diet needs thoughtful planning. Iron, vitamin B12, calcium, vitamin D, zinc and protein deserve particular attention.