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Subject: Biology
Semester: 1
Period: 2
Week: 9
School Name:
Teacher’s Name:
Subject: Biology
Grade Level: Grade 11
Date: Week 9
Lesson Duration: 45 minutes
Week & Term: Week 9, Period II
Topic: Nutrition and Food Preservation
Sub-topic: Balanced Diet and Malnutrition
Learning Objectives
By the end of the lesson, students should be able to:
- Define balanced diet and explain its importance to health.
- Identify the components of a balanced diet.
- Describe malnutrition and its types.
- Explain the causes, symptoms, and prevention of malnutrition.
Previous Knowledge
Students already know:
• Classes of food and their functions in the body
• Food items common in their homes and communities
Instructional Materials
- Food pyramid/chart
• Posters showing malnourished children (e.g. kwashiorkor, marasmus)
• Nutrition flashcards
• Videos or real-life case examples (if available)
Lesson Development – ABC Model
A – Anticipation (Warm-up / Starter)
Time: 5–10 mins
Ask: “Can a person eat every day and still be unhealthy? Why?”
Allow students to share ideas. Then explain how food quantity is not the same as food quality.
Teacher’s Role: Trigger curiosity and real-life connection
Learner’s Role: Share personal or community experiences related to poor eating habits or visible signs of undernourishment
B – Building Knowledge (Main Lesson Body)
Time: 25–30 mins
Teacher explains:
• Balanced Diet: A meal that contains all the food nutrients in the correct proportions needed for proper body function.
• Components: Carbohydrates, proteins, fats, vitamins, minerals, and water.
• Malnutrition: A health condition caused by an improper or insufficient diet. It includes both undernutrition (too little food) and overnutrition (too much of wrong kinds of food).
• Types of Malnutrition:
- Kwashiorkor: Lack of protein. Symptoms – swollen belly, thin limbs, fatigue
- Marasmus: Severe energy deficiency. Symptoms – extreme thinness, weakness
• Causes: Poor diet, poverty, ignorance, disease
• Prevention: Proper meal planning, health education, food availability
Learners’ Activities (Expanded):
• Create and present a sample of a balanced meal using food cut-outs or drawings
• Small group discussion: compare children with balanced and unbalanced diets
• Analyze school lunch or home meals – is it balanced or not?
• Match photos of symptoms with the correct malnutrition type
• Role play: “a health worker advising a mother with a malnourished child”
Assessment Checks:
✓ Oral questions on symptoms of malnutrition
✓ Identify if a given meal is balanced or not
✓ Complete a cloze passage on effects of protein deficiency
Notes (Expanded & Detailed):
A balanced diet helps the body function effectively. It must include all six classes of nutrients in the right amounts. Eating only carbohydrates or only fats may lead to malnutrition. Malnutrition leads to weakness, poor immunity, stunted growth, or even death.
Kwashiorkor results from lack of protein and is common in children weaned off breast milk too early without enough protein in their new diet. Marasmus is due to general starvation and causes extreme thinness.
Balanced nutrition is important for physical and mental development, especially in children and adolescents.
C – Consolidation (Conclusion & Assessment)
Time: 5–10 mins
Recap the meaning of a balanced diet, malnutrition types, and their symptoms.
Evaluation Method (Expanded):
• Describe two symptoms of kwashiorkor or marasmus
• Fill in a table with food nutrients missing in different diet examples
• List two preventive measures for malnutrition
Assignment (Expanded):
- Draw a sample plate of a balanced meal using foods you eat at home. Label each nutrient group.
- Interview an elderly person in your community about how they fed their children to avoid malnutrition. Summarize your findings.
- Write a short speech as a health worker educating rural parents on the dangers of malnutrition.
Differentiation / Inclusive Strategies
- Struggling Learners: Use picture-based food charts for memory aid
• Advanced Learners: Prepare a poster on the effects of malnutrition in Liberia
• Students with Disabilities: Group tasks with support and larger font handouts
Teacher’s Reflection (After Class)
• What worked well?
• What needs improvement?
• Students’ engagement level: □ High □ Medium □ Low
• Next steps: Introduce teeth, dental care and how nutrition affects dental health