HUMAN NUTRITION

Lecture Outline

  1. The Language of Nutrition

  2. Importance of Knowledge in Nutrition

  3. Food Choices

  4. Nutrition Tools

  5. Nutrition and Health

Key Concepts

The Language of Nutrition

  • Definition of Food and Nutrition:

    • Food: Substance comprising proteins, carbohydrates, fats, and nutrients.

    • Nutrition: Study of foods, their nutrients, and their effects on health.

Differences between Food Science and Nutrition

  • Food Science:

    • Study of the physical, biological, and chemical composition of food.

    • Involves food processing and preservation techniques.

    • Emphasizes safety, nutrition, and availability of food.

  • Nutrient:

    • Chemical substances needed by the body available in food.

  • Nutrition:

    • In-depth study of foods and their impact on health, integrating various scientific fields.

Nutritional Status Definitions

  • Nutritional Status: Condition related to nutrient intake and use.

  • Optimal Nutritional Status: Sufficient nutrients for normal body functions and surplus storage.

  • Malnutrition: Imbalances in nutrient intake leading to deficiencies or excesses.

Food and Diet

  • Food Groups: Categorized based on key nutrient content.

  • Diet: Regular consumption patterns of food and beverages.

  • Meal: Defined eating occasions throughout the day.

Vegetarian Diet Types

  1. Vegan: No animal products.

  2. Ovo-vegetarian: Excludes dairy, includes eggs.

  3. Lacto-ovo vegetarian: Includes dairy and eggs, excludes meat.

  4. Lacto-vegetarian: Includes dairy, excludes all meat and eggs.

Mediterranean Diet

  • Based on traditional foods of the Mediterranean region.

  • Emphasizes whole grains, fruits, vegetables, legumes, and healthy fats.

  • It is associated with lower mortality rates and increased life expectancy.

Food Portions

  • Food Serving: Standardized amount of food, varies by product.

  • Food Portion: Amount consumed in one eating session.

Factors Influencing Food Choices

  • Biological determinants: Hunger, taste, and appetite.

  • Economic determinants: Cost and income level.

  • Physical factors: Access to food, skills, and education.

  • Social factors: Cultural influences and family.

  • Psychological factors: Mood, stress, and beliefs about food.

Importance of Knowledge in Nutrition

  • Good nutrition fosters a healthy lifestyle, helps maintain weight, and reduces chronic disease risks.

  • Encourages physical activity combined with nutritious diets for overall health improvement.

Nutrient Classes and Functions

  • 6 classes of nutrients: Carbohydrate, Protein, Fat, Vitamin, Mineral & Water

  • Characteristics of essential nutrients:

  • Have a specific biological function

  • if removed from the diet: the body will experience negative physiological effects

  • when returned to the diet before permanent damage - restore normal biological function

  • Macronutrients: Needed in large amounts (e.g., carbohydrates, proteins, fats).

  • Micronutrients: Needed in smaller quantities (e.g., vitamins, minerals).

Nutritional Tools and Guidelines

  • Malaysian Dietary Reference Intake (RNI): Provides nutrient intake standards for healthy individuals.

  • Nutrition Labeling: Essential for guiding consumer choices regarding nutrient contents.

Relationship Between Nutrition and Health

  • Nutrition directly affects health through disease prevention, weight management, and energy maintenance.

  • Poor nutrition contributes to deficiency diseases and chronic conditions linked to mortality.

This structured overview encompasses the key principles of human nutrition from the provided lecture details, focusing on definitions, dietary types, nutritional importance, and health connections.