Consequences of poor nutrition for SS 1

Class: SS 1
Term: First Term
Week: 4
Age: 15 years
Duration: 60 minutes
Subject: Food and Nutrition
Curriculum Theme: Food Nutrients for Healthy Living
Focal competence: Applying knowledge of food nutrients based on their composition for healthy meal planning
Key competencies/values: Collaboration; ICT and Digital Competencies; Digital Competencies
Skills:

• Identifying signs and effects of poor nutrition
• Appreciating good nutrition in overall wellbeing

Previous Lesson: Functions of Food in the Body, Growth, Regulation and Disease Protection
Topic: Introduction To Foods And Nutrition: Consequences Of Poor Nutrition
Subject Matter: Consequences of poor nutrition

Specific Objectives

By the end of the lesson, pupils/students should be able to:

Cognitive Domain

• Identify consequences of poor nutrition.
• Explain the consequences of poor nutrition.

Affective Domain

• Appreciate the importance of good nutrition for overall wellbeing.

Psychomotor Domain

• Identify observable signs and effects of poor nutrition.

Reference Materials

The following resources were used in planning this lesson:

• 2025 New Revised Senior Secondary Education Curriculum (SSEC)
• Relevant State Unified Scheme of Work
• A suitable Food and Nutrition textbook for SS 1
• The HeadTeacher Scheme of work For The New Revised Senior Secondary Education Curriculum (SSEC)

Instructional Materials

The teacher will teach this lesson with the aid of:

• Charts/posters showing food classification and examples of nutritional deficiencies
• Internet-enabled devices (e.g., tablets, smartphones, computer with projector)
• Video clips on consequences of poor nutrition
• Pictures of individuals suffering from malnutrition

Rationale for the Lesson

This lesson is important because it highlights the severe health and developmental problems that arise from inadequate or unbalanced diets. Understanding these consequences empowers students to make informed food choices and promotes healthy eating habits for themselves and their families. This knowledge is crucial for preventing diet-related diseases and fostering overall wellbeing.

Prerequisite/Previous Knowledge

Students should have basic knowledge of food and its functions, as well as an understanding of different food nutrients and their sources.

Lesson Content/Board Summary

Consequences Of Poor Nutrition

Poor nutrition, also known as malnutrition, occurs when a person’s diet does not provide adequate nutrients for growth, maintenance, and proper body function, or when they consume too many nutrients. It encompasses both under-nutrition (not enough food or specific nutrients) and over-nutrition (too much food, leading to obesity).

Types of Poor Nutrition (Malnutrition)

Poor nutrition can manifest in different forms, including:

1. Under-nutrition: This results from insufficient intake of food or specific nutrients. It includes:
   1. Undernutrition: Not consuming enough calories or protein.
   2. Micronutrient deficiencies: Lack of essential vitamins and minerals (e.g., iron, iodine, Vitamin A).
   3. Wasting: Low weight for height, indicating recent rapid weight loss.
   4. Stunting: Low height for age, indicating chronic under-nutrition.
2. Over-nutrition: This results from excessive intake of calories and nutrients, leading to overweight and obesity.

Specific Consequences of Poor Nutrition

Poor nutrition has wide-ranging negative effects on an individual’s health, development, and overall quality of life. These consequences include:

1. Stunted Growth and Development:
   1. Physical Stunting: Children who are undernourished, especially during their early years, may not reach their full height potential.
   2. Impaired Brain Development: Lack of essential nutrients like iron, iodine, and protein can hinder cognitive development, leading to poor academic performance and reduced intellectual capacity.
2. Weakened Immune System:
   1. Poor nutrition compromises the body’s ability to fight off infections and diseases. Individuals become more susceptible to common illnesses like malaria, typhoid, and respiratory infections.
   2. Recovery from illness is often prolonged due to a lack of energy and building blocks for tissue repair.
3. Specific Deficiency Diseases:
   1. Kwashiorkor: Caused by severe protein deficiency, characterised by swollen abdomen, oedema, skin lesions, and reddish hair. Common in children who have been weaned from breast milk onto a starchy diet.
   2. Marasmus: Caused by severe deficiency of both protein and calories, leading to extreme thinness, muscle wasting, and a “skin and bones” appearance.
   3. Anaemia: Often due to iron deficiency, resulting in fatigue, weakness, pale skin, and reduced oxygen-carrying capacity of the blood. Pregnant women and young children are particularly vulnerable.
   4. Goitre: Caused by iodine deficiency, leading to an enlarged thyroid gland in the neck. It can also cause mental impairment.
   5. Night Blindness (Xerophthalmia): Caused by Vitamin A deficiency, impairing vision in low light and potentially leading to permanent blindness.
   6. Rickets: Caused by Vitamin D and calcium deficiency, leading to soft and weak bones, especially in children, causing bowed legs.
4. Reduced Physical Activity and Productivity:
   1. Lack of energy from insufficient food intake leads to chronic fatigue and reduced capacity for physical work or exercise.
   2. This impacts productivity in school, work, and daily chores, contributing to poverty cycles.
5. Increased Risk of Chronic Diseases (Over-nutrition):
   1. Excessive consumption of unhealthy foods (high in sugar, unhealthy fats, and salt) leads to overweight and obesity.
   2. Obesity increases the risk of non-communicable diseases such as type 2 diabetes, heart disease, high blood pressure, and certain cancers.
6. Poor Reproductive Health:
   1. Malnutrition in women can lead to complications during pregnancy, low birth weight babies, and increased maternal and infant mortality.
   2. It can also affect fertility.
7. Mental Health Issues:
   1. Nutrient deficiencies can contribute to depression, anxiety, and other mental health problems.
   2. Poor nutrition can affect mood regulation and overall psychological well-being.

Health Relevance and Practical Household Examples

Understanding these consequences is vital for making healthy food choices at home. For example:

1. A child who frequently falls ill and misses school might be suffering from a weakened immune system due to a diet lacking fruits, vegetables, and protein.
2. A family that relies heavily on starchy foods like garri or yam without adequate protein (beans, fish) or vitamins (leafy greens) might see their children develop signs of Kwashiorkor or Marasmus.
3. A teenager who is constantly tired and struggles to concentrate in class could be anaemic due to insufficient iron intake from foods like liver, dark leafy greens, or fortified cereals.
4. Consuming too many sugary drinks and fried snacks can lead to weight gain and increase the risk of developing diabetes later in life, a common issue in many Nigerian households.

Teaching Methods/Instructional Techniques

Discussion, Explanation, Question and Answer, Group Work, Visual Aids (Charts, Videos)

Instructional Procedures

Step 1: Introduction

Time: 5 minutes

Teaching Skill: Engaging/Recalling

Teacher’s Activity: The teacher greets the students and reviews the previous lesson on the functions of food and different food nutrients. The teacher then asks students to briefly discuss what happens when the body does not get enough of these important nutrients or gets too much of certain ones.

Pupils’ Activity: Pupils respond to questions and share their ideas on what happens with poor nutrition.

Learning Point: Link to previous knowledge

Step 2: Exploring Poor Nutrition

Time: 7 minutes

Teaching Skill: Explanation/Visualisation

Teacher’s Activity: The teacher introduces the topic “Consequences of Poor Nutrition” and explains what poor nutrition (malnutrition) means, distinguishing between under-nutrition and over-nutrition. The teacher uses charts or pictures to illustrate these concepts.

Pupils’ Activity: Pupils listen attentively, observe the charts/pictures, and ask clarifying questions.

Learning Point: Meaning of poor nutrition

Step 3: Identifying Physical Consequences

Time: 7 minutes

Teaching Skill: Demonstration/Discussion

Teacher’s Activity: The teacher guides students to identify specific physical consequences of under-nutrition, such as stunted growth, wasting, and specific deficiency diseases like Kwashiorkor, Marasmus, and anaemia. The teacher uses video clips or pictures to show the signs and effects.

Pupils’ Activity: Pupils observe the video clips/pictures, identify the signs, and discuss their observations.

Learning Point: Physical effects of malnutrition

Step 4: Explaining Health Consequences

Time: 7 minutes

Teaching Skill: Explanation/Questioning

Teacher’s Activity: The teacher explains further consequences such as a weakened immune system, reduced physical activity, and the increased risk of chronic diseases (e.g., diabetes, heart disease) due to over-nutrition. The teacher asks questions to ensure understanding.

Pupils’ Activity: Pupils listen, take notes, and answer questions posed by the teacher.

Learning Point: Health implications of poor nutrition

Step 5: Discussing Developmental and Social Consequences

Time: 7 minutes

Teaching Skill: Facilitation/Group Work

Teacher’s Activity: The teacher guides students to brainstorm in groups on how poor nutrition affects brain development, academic performance, and overall productivity. The teacher encourages students to share practical household examples of these consequences.

Pupils’ Activity: Pupils work in groups, brainstorm ideas, and share their findings with the class.

Learning Point: Developmental and social impacts

Step 6: Reinforcing Health Relevance and Prevention

Time: 7 minutes

Teaching Skill: Reinforcement/Application

Teacher’s Activity: The teacher summarises the health relevance of understanding poor nutrition and briefly discusses how good nutrition can prevent these consequences. The teacher relates the discussion to the importance of balanced diets and hygiene.

Pupils’ Activity: Pupils participate in the summary discussion and ask final questions.

Learning Point: Importance of good nutrition

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

1. Mention three consequences of poor nutrition.
2. Explain how under-nutrition can affect a child’s academic performance.
3. Name two deficiency diseases and their causes.
4. How does over-nutrition lead to health problems?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Assessment of understanding

Step 8: Note-Taking

Time: 10 minutes

Teaching Skill: Guided Writing

Teacher’s Activity: The teacher guides pupils/students to copy the essential Board Summary notes on the consequences of poor nutrition into their notebooks.

Pupils’ Activity: Pupils/students copy the notes carefully into their notebooks.

Learning Point: Recording lesson content

Step 9: Conclusion

Time: 5 minutes

Teaching Skill: Summarising

Teacher’s Activity: The teacher summarises the lesson by reiterating that both insufficient and excessive nutrient intake have severe negative consequences on health and development, emphasising the importance of a balanced diet for overall wellbeing.

Pupils’ Activity: Pupils listen and participate in the final summary.

Learning Point: Consolidation of key learning

Continuous Assessment/Further Study

Type: Homework/Further Reading

Instruction: Research and write a short essay (about 150 words) on one specific nutritional deficiency disease common in Nigeria. Your essay should include:

1. The name of the disease.
2. Its primary cause (which nutrient is lacking).
3. Observable symptoms or signs.
4. Simple ways to prevent it through diet.

Lesson Keywords

• Malnutrition – A condition resulting from nutrient deficiency or excess.
• Under-nutrition – Insufficient intake of food or specific nutrients.
• Over-nutrition – Excessive intake of calories and nutrients, leading to obesity.
• Kwashiorkor – Protein deficiency disease, causing swollen abdomen.
• Marasmus – Severe calorie and protein deficiency, causing extreme thinness.
• Anaemia – Iron deficiency, leading to fatigue and weakness.
• Goitre – Iodine deficiency, causing an enlarged thyroid gland.
• Stunting – Low height for age, indicating chronic under-nutrition.
• Wasting – Low weight for height, indicating acute under-nutrition.

Differentiation

Support: Provide simplified charts and visual aids for students who struggle with abstract concepts. Pair weaker students with stronger ones for group activities. Offer sentence starters for essay writing.

Extension: Encourage advanced students to research the economic impact of malnutrition on national development or explore the role of international organisations in combating malnutrition in Nigeria.

Suggested Lesson Videos

For video resources, search on YouTube for: consequences of poor nutrition for students