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Health: The Ultimate Treasure - Health: Is It More Than Not Falling Sick?

Grade 8CBSE

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

🔑Concepts

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Definition of Health: According to the World Health Organization (WHO), health is a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity.

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Healthy vs. Disease-free: Being 'disease-free' means the body is not suffering from any specific ailment. However, being 'healthy' includes mental peace and social adjustment. For example, an athlete might be disease-free but not 'healthy' if they are under extreme mental stress.

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Personal Health: This depends on individual habits such as eating a balanced diet, maintaining personal hygiene (bathing, brushing), and getting regular exercise and sleep.

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Community Health: Health is not just about the individual; it depends on the environment. Proper garbage disposal, clean drinking water, and pest control are essential for community health.

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Nutrition: A balanced diet is required for growth and repair. It includes CarbohydratesCarbohydrates, ProteinsProteins, FatsFats, VitaminsVitamins, MineralsMinerals, RoughageRoughage, and WaterWater.

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Body Mass Index (BMI): A statistical measure used to determine if an individual's weight is appropriate for their height, calculated as Weight in kg(Height in m)2\frac{\text{Weight in kg}}{(\text{Height in m})^2}.

📐Formulae

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

Total Energy Intake=Basal Metabolic Rate (BMR)+Physical Activity Energy\text{Total Energy Intake} = \text{Basal Metabolic Rate (BMR)} + \text{Physical Activity Energy}

💡Examples

Problem 1:

A student has a body mass of 50 kg50\text{ kg} and a height of 1.6 m1.6\text{ m}. Calculate their BMI and determine if they are in the healthy range (Standard healthy range: 18.518.5 to 24.924.9).

Solution:

Given: Mass=50 kgMass = 50\text{ kg}, Height=1.6 mHeight = 1.6\text{ m}. Using the formula: BMI=50(1.6)2BMI = \frac{50}{(1.6)^2} BMI=502.56BMI = \frac{50}{2.56} BMI≈19.53 kg/m2BMI \approx 19.53\text{ kg/m}^2

Explanation:

Since 19.5319.53 falls within the range of 18.518.5 to 24.924.9, the student is considered to have a healthy weight for their height.

Problem 2:

Explain why a person living in a crowded, unhygienic area might be considered 'unhealthy' even if they do not show symptoms of any illness.

Solution:

Health is a state of physical, mental, and social well-being. In an unhygienic area, there is constant social and mental stress, along with a high risk of future infections from pathogens.

Explanation:

The lack of 'social well-being' and the environmental risk factors mean the individual does not meet the WHO definition of health, despite being currently 'disease-free'.