Lesson Notes By Weeks and Term v4 - SHS 2
Nutrition and Diet in Health
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Nutrition and Diet in Health
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Subject: Physical Education Health Elective
Class: SHS 2
Term: 1st Term
Week: 11
Grade code: 2.1.1.LI.2
Strand code: 1
Sub-strand code: 2
Content standard code: 2.1.1.CS.1
Indicator code: 2.1.1.LI.2
Theme: Health Education
Subtheme: Nutrition and Diet in Health
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Welcome, students. Today, we are going to explore a very important topic that affects us every single day: the food we eat. When you walk through a market like Makola or Kejetia, or go into a modern supermarket like Shoprite, you see a huge variety of foods. Some are labelled "organic," some are very sweet, and many come in packages. These are not all the same. The choices we make about which foods to eat have a direct and powerful impact on our energy levels, our ability to fight sickness, our weight, and our long-term health. Understanding the difference between organic, genetically modified (GMO), sugary, and processed foods is a critical skill for living a healthy life in modern Ghana.
This lesson focuses on four key categories of food that are increasingly common in our diet. Let's break them down one by one. A. Organic Foods Definition: Organic foods are grown and processed without the use of synthetic (man-made) fertilizers, pesticides, herbicides, or genetically modified organisms. For animal products like meat, eggs, and milk to be organic, the animals must be raised on organic feed and not be given antibiotics or growth hormones. Key Idea: The focus is on natural farming methods that work with the ecosystem, promoting soil health and biodiversity. Ghanaian Context & Examples: The cocoyam, plantain, or cassava grown in your family's backyard farm without using any chemical fertilizers is essentially organic. Vegetables like *kontomire* or *alefu* sold at local farmers' markets, grown by small-scale farmers using traditional methods (like manure for fertilizer), are often organic by practice, even if they don't have an official certificate. There are also now certified organic farms in Ghana (e.g., for pineapples or vegetables) that export their produce. Impact on Health: Potential Positives: Lower Pesticide Residue: Consuming organic foods may reduce your exposure to synthetic pesticides, which some studies link to health problems over the long term. Higher Nutrient Content (Sometimes): Some research suggests that certain organic foods may have slightly higher levels of specific nutrients, like antioxidants, compared to their conventionally grown counterparts. Environmental Health: Organic farming is better for the soil, water, and local wildlife, which indirectly supports community health. Potential Negatives: Higher Cost: Organic farming is often more labour-intensive and can have lower yields, making the final product more expensive for the average Ghanaian consumer. Accessibility: Certified organic foods are not widely available in all markets, often limited to specialized shops in larger cities. Natural Toxins: "Organic" does not mean "toxin-free." Plants have natural defense mechanisms, and improper farming or storage can still lead to contamination (e.g., aflatoxins in groundnuts or maize). B. Genetically Modified (GM) Foods Definition: Genetically Modified Organisms (GMOs) are plants, animals, or microorganisms whose genetic material (DNA) has been altered in a way that does not occur naturally through mating or natural recombination. This is often done to introduce a desirable trait. Key Idea: Scientists can take a specific gene from one organism (e.g., a bacterium that produces a natural insecticide) and insert it into another (e.g., a maize plant) to give it a new ability. Ghanaian Context & Examples: As of now, there are no commercially grown GM crops in Ghana, but there is active research and debate. A key example is the development of Bt Cowpea (a type of beans). It has been modified to resist the Maruca pod borer, an insect that can destroy up to 80% of the crop. This could drastically increase the amount of beans available for food. Many imported processed foods available in Ghanaian supermarkets (e.g., cereals, cooking oils from soy or corn) may contain ingredients from GM crops grown in other countries. Impact on Health: This is a highly debated topic. Potential Positives (Proponents' View): Increased Food Security: GM crops can be designed to resist pests, diseases, and drought, leading to higher yields and more stable food supplies. This is very important for a country like Ghana. Enhanced Nutrition: Scientists are working on "biofortified" crops, like "Golden Rice" (modified to have more Vitamin A), to combat micronutrient deficiencies. Reduced Pesticide Use: Crops engineered to be insect-resistant (like Bt Cowpea) may require less spraying of chemical pesticides. Potential Negatives (Critics' View): Allergies: There is a theoretical concern that inserting new genes could create new allergens in food. However, all GM foods are tested for this. Long-term Effects Unknown: Critics argue that we have not been consuming GM foods long enough to know all their potential long-term health effects. Corporate Control: There are concerns that a few large multinational companies will control the seed supply, making farmers dependent on them. This is more of an economic/social impact but affects community well-being. C. Sugary Foods Definition: These are foods and drinks with a high amount of added sugars. This is different from the natural sugars found in fruits (*fructose*) or milk (*lactose*). Added sugars are sugars and syrups put in foods during processing or preparation. Key Idea: The body processes natural sugars from whole foods differently than refined, added sugars. Added sugars provide "empty calories" – energy with little to no nutritional value (vitamins, minerals, fibre). Ghanaian Context & Examples: Drinks: Sodas (Coca-Cola, Fanta), Malta Guinness, Kalypo, sweetened fruit juices, and even locally made drinks like *sobolo* or *asana* when excessive sugar is added. Snacks: Biscuits (digestives, shortbread), FanIce, cakes, toffees, and some breakfast cereals. Impact on Health: The negative impacts are well-documented and significant. Potential Positives: Quick Energy Source: Sugar provides a rapid source of energy, which can be useful for athletes during intense activity. Palatability: Sugar makes food taste better, which can encourage eating. Potential Negatives: Weight Gain and Obesity: Excess sugar is converted into fat by the body, leading to weight gain. This is a major risk factor for many diseases. Type 2 Diabetes: A high-sugar diet can lead to insulin resistance, where the body's cells stop responding properly to insulin, causing high blood sugar levels. Ghana is seeing a rapid increase in Type 2 Diabetes. Heart Disease: High sugar intake is linked to higher blood pressure, inflammation, and unhealthy blood fat levels, all of which increase the risk of heart disease. Tooth Decay: Sugar is the main food source for bacteria in the mouth that cause cavities. D. Processed Foods Definition: A processed food is any food that has been altered from its natural state. This is a very broad category. It can range from minimally processed (e.g., washed and packaged spinach) to ultra-processed (e.g., instant noodles). We are most concerned with ultra-processed foods. These are made from substances extracted from foods (like fats, starches, and sugars) and often contain additives like artificial colours, flavours, and preservatives. Key Idea: The more processed a food is, the more its nutritional structure is changed, and the more likely it is to contain high levels of unhealthy fats, sugar, and salt (sodium). Ghanaian Context & Examples: Minimally Processed: Bagged *gari*, frozen chicken, pasteurized milk. Moderately Processed: Canned fish (sardines, mackerel), tomato paste, bread. Ultra-Processed: Indomie instant noodles, sausages (*"Tsistsi"*) , corned beef, digestive biscuits, breakfast cereals, cheese analogues. Impact on Health: Potential Positives: Convenience: Processed foods are quick and easy to prepare, which is helpful for busy students, workers, and families in cities like Accra and Kumasi. Food Safety & Preservation: Processes like canning and pasteurization kill harmful bacteria and allow food to be stored for a long time, reducing food spoilage. Fortification: Some processed foods are fortified with extra nutrients (e.g., iodine in salt, Vitamin A in cooking oil) to help combat deficiencies. Potential Negatives (especially Ultra-Processed): High in Sodium, Sugar, and Unhealthy Fats: These are often added to improve taste and shelf life but contribute to hypertension (high blood pressure), heart disease, and obesity. A single pack of Indomie can contain more than half your recommended daily sodium intake. Low in Fibre and Nutrients: The processing often removes beneficial components like dietary fibre, vitamins, and minerals. Artificial Additives: Concerns exist about the long-term effects of consuming a diet high in artificial colours, flavours, and preservatives. Overconsumption: These foods are often designed to be "hyper-palatable," meaning they are so tasty that it's easy to eat too much of them.
Guided Practice (With Solutions)
*(Instructions: Form groups of 4-5. Discuss the following questions for 10 minutes and prepare to share your answers with the class.)*
Question 1 (Recall & Understanding): Your friend buys a bottle of Fanta and a fresh orange from a seller at the roadside. Both are sweet. Explain to your friend why the sugar in the Fanta has a different impact on their health compared to the sugar in the orange. Solution & Commentary: Solution: The sugar in the Fanta is added sugar (likely sucrose or high-fructose corn syrup). It provides "empty calories" with no other nutrients. It is absorbed very quickly into the bloodstream, causing a rapid spike in blood sugar. The sugar in the orange is natural sugar (*fructose*). Crucially, the orange also contains dietary fibre, vitamins (like Vitamin C), and water. The fibre slows down the absorption of the sugar, preventing a sharp blood sugar spike. The vitamins and other nutrients contribute positively to health. Therefore, while both are sweet, the orange is a much healthier choice because the sugar comes in a package with beneficial nutrients, especially fibre. Commentary: This question helps students differentiate between natural and added sugars, a key concept. It uses a very common Ghanaian scenario to make the learning practical.