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Adolescence: A Stage of Growth and Change - Meeting nutritional needs

Grade 7CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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Adolescence is a period of rapid growth and development, which necessitates a Balanced Diet containing CarbohydratesCarbohydrates, FatsFats, ProteinsProteins, VitaminsVitamins, and MineralsMinerals in the right proportions.

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Iron (FeFe) is a vital mineral for blood formation. It is essential for the synthesis of hemoglobin. Adolescent girls, in particular, need iron-rich foods like leafy vegetables, jaggery, and citrus fruits to compensate for blood loss during menstruation.

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Calcium (CaCa) and Phosphorus (PP) are critical for the 'growth spurt' to ensure the development of strong bones and teeth.

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Proteins act as the building blocks of the body, supporting the growth of muscles and the repair of tissues during this transition phase.

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The energy requirement of an adolescent is higher than that of an adult or a younger child, measured in kilocalories (kcalkcal).

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Avoidance of 'Junk Food' is necessary because, while tasty, it lacks the required nutrients (VitaminsVitamins and MineralsMinerals) and contains excessive FatsFats and SugarsSugars.

📐Formulae

BMI=Mass (kg)Height (m)2BMI = \frac{\text{Mass (kg)}}{\text{Height (m)}^2}

Total Energy (kcal)=Energy from Carbs+Energy from Proteins+Energy from Fats\text{Total Energy (kcal)} = \text{Energy from Carbs} + \text{Energy from Proteins} + \text{Energy from Fats}

Hemoglobin level∝Dietary Iron Intake\text{Hemoglobin level} \propto \text{Dietary Iron Intake}

💡Examples

Problem 1:

Calculate the Body Mass Index (BMIBMI) of an adolescent girl who weighs 40 kg40\text{ kg} and has a height of 1.6 m1.6\text{ m}.

Solution:

BMI=40(1.6)2=402.56≈15.625 kg/m2BMI = \frac{40}{(1.6)^2} = \frac{40}{2.56} \approx 15.625\text{ kg/m}^2

Explanation:

By using the BMIBMI formula, we divide the weight by the square of the height to check if the adolescent's growth is within the healthy range for their age group.

Problem 2:

If a balanced meal for a teenager should consist of 60%60\% carbohydrates, 15%15\% proteins, and 25%25\% fats, calculate the energy contribution from proteins if the total daily requirement is 2400 kcal2400\text{ kcal}.

Solution:

Energy from Proteins=15100×2400=15×24=360 kcal\text{Energy from Proteins} = \frac{15}{100} \times 2400 = 15 \times 24 = 360\text{ kcal}

Explanation:

This shows how specific nutrients contribute to the total energy (kcalkcal) required for the body's metabolic activities during adolescence.