Summary
Nutrients are molecules in food essential for energy, growth, development, and reproduction. They are categorized into macronutrients (carbohydrates, proteins, fats) and micronutrients (vitamins, minerals). Carbohydrates are the main energy source, proteins are crucial for growth and repair, and lipids store energy and insulate the body.
- Carbohydrates — organic compounds made of carbon, hydrogen, and oxygen. Example: Glucose is a monosaccharide that provides immediate energy.
- Proteins — composed of amino acids containing carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. Example: Enzymes are proteins that catalyze biochemical reactions.
- Lipids — consist of glycerol and fatty acids, insoluble in water. Example: Fats store energy and form cell membranes.
- Vitamins — organic compounds required in small amounts for health. Example: Vitamin C is necessary for wound healing.
- Minerals — inorganic elements needed for body functions. Example: Iron is a component of hemoglobin in blood.
Exam Tips
Key Definitions to Remember
- Carbohydrates: Organic compounds made of carbon, hydrogen, and oxygen.
- Proteins: Polymers of amino acids essential for body functions.
- Lipids: Organic molecules that store energy and form cell membranes.
- Vitamins: Organic compounds needed in small amounts for health.
- Minerals: Inorganic elements essential for body functions.
Common Confusions
- Confusing macronutrients with micronutrients.
- Misunderstanding the role of carbohydrates as only energy sources.
Typical Exam Questions
- What is the role of carbohydrates in the body? Carbohydrates provide energy and are stored as glycogen.
- How do proteins contribute to body functions? Proteins are involved in growth, repair, and enzyme production.
- What is the function of lipids? Lipids store energy and form cell membranes.
What Examiners Usually Test
- Understanding of nutrient functions and examples.
- Ability to identify and describe food tests for nutrients.
- Differences between macronutrients and micronutrients.