krit.club logo

Health: The Ultimate Treasure - How Can We Stay Healthy?

Grade 8CBSE

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

🔑Concepts

•

Health is defined by the WHO as a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity.

•

A Balanced Diet must contain the correct proportions of carbohydrates, proteins, fats, vitamins, minerals, roughage, and water. For an adolescent, the requirement for Iron (FeFe) increases to support blood formation.

•

Nutritional needs for adolescents are high because it is a stage of rapid growth and development. Deficiencies in minerals like Calcium (Ca2+Ca^{2+}) can lead to poor bone density.

•

Personal Hygiene is crucial to prevent bacterial and viral infections. This includes bathing regularly and washing hands to remove pathogens.

•

Physical Exercise helps in maintaining a healthy Body Mass Index (BMIBMI) and improves blood circulation and cardiovascular health.

•

The Body Mass Index (BMIBMI) is a tool used to determine if a person is underweight, normal weight, overweight, or obese based on their height and weight.

📐Formulae

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

Energy Balance=Energy Intake−Energy Expenditure\text{Energy Balance} = \text{Energy Intake} - \text{Energy Expenditure}

💡Examples

Problem 1:

A student named Rahul weighs 45 kg45\text{ kg} and his height is 1.5 m1.5\text{ m}. Calculate his BMIBMI and determine if he falls within the healthy range (Healthy range: 18.518.5 to 24.924.9).

Solution:

Given: Weight=45 kg\text{Weight} = 45\text{ kg}, Height=1.5 m\text{Height} = 1.5\text{ m}. Using the formula: BMI=45(1.5)2BMI = \frac{45}{(1.5)^2} BMI=452.25BMI = \frac{45}{2.25} BMI=20BMI = 20

Explanation:

Since his BMIBMI is 2020, which lies between 18.518.5 and 24.924.9, Rahul is in the healthy weight range.

Problem 2:

Arun was tracking his weight over two months. In the first month, he weighed 85 kg85\text{ kg}. After following a strict diet and exercise plan, he lost 7 kg7\text{ kg}. Calculate his new weight using vertical subtraction.

Solution:

To find the new weight, subtract the weight lost from the initial weight: 85−778\begin{array}{r} 85 \\ - 7 \\ \hline 78 \end{array}

Explanation:

Arun's final weight after the health program is 78 kg78\text{ kg}.

Problem 3:

An adolescent requires approximately 2500 kcal2500\text{ kcal} per day. If they consume a meal providing 850 kcal850\text{ kcal}, how many more calories are needed for the day?

Solution:

2500−8501650\begin{array}{r} 2500 \\ - 850 \\ \hline 1650 \end{array}

Explanation:

The adolescent needs to consume an additional 1650 kcal1650\text{ kcal} to meet their daily requirement.