Nutrition in Canada

Nutrition Overview

  • Learning Objectives:

    • Understanding nutrients and their role in health.

    • Overview of nutrition in Canada.

    • Exploring methods of gaining knowledge about nutrition.

  • Textbook Reference: Smolin, Grosvenor, Gurfinkel, Nutrition Science Applications, 3rd Canadian Edition, Chapter 1.

Nutrition as a Discipline

  • Definition: An interdisciplinary science studying interactions between living organisms and foods.

  • Subfield: Sport Nutrition

    • Specializes within the nutrition field and requires knowledge of exercise physiology.

    • Focuses on:

      • Energy for physical activity and competition.

      • Nutrient supply for repair and recovery.

      • Practical dietary strategies for performance enhancement.

Understanding Nutrients

  • What are Nutrients?

    • There are 6 classes of nutrients essential for health.

  • Functions of Nutrients:

    • Provide energy.

    • Support growth and development.

    • Assist in bodily functions and regulatory processes.

  • Types of Malnutrition:

    • Insufficient intake of energy or nutrients.

    • Excessive nutrient intake.

Energy and Macronutrients

  • Energy Provided by Macronutrients:

    • Macronutrient energy values in kilocalories per gram:

      • Carbohydrate: 4 kcal/g (16.7 kJ/g)

      • Lipid: 9 kcal/g (37.6 kJ/g)

      • Protein: 4 kcal/g (16.7 kJ/g)

      • Alcohol: 7 kcal/g (29.3 kJ/g)

  • Conversion Factors:

    • 1 kilocalorie = 4.18 kilojoules.

Body Composition and Fluids

  • Extracellular Fluid Composition:

    • Contains various substances:

      • 6% minerals

      • Carbohydrates

      • Proteins (globular and channel proteins)

    • Lipids:

      • Composed of phospholipid bilayers, cholesterol, and proteins.

    • Hydrophilic & Hydrophobic Regions:

      • Essential for cell membrane structure.

Malnutrition

  • Definition: An imbalance between nutrient supply and body demand impacting growth and functions.

  • Types of Malnutrition:

    • Insufficient energy or nutrient intake.

    • Excess nutrients leading to health issues.

Nutrition and Health Interactions

  • Diet-Gene Interactions:

    • Investigates how diet affects gene functioning and health outcomes.

  • Influencing Factors on Health:

    • Diet, lifestyle, environment, and genetic predispositions influence nutrition and health.

  • Risk Factors:

    • Conditions or behaviors increasing disease frequency not necessarily causal.

    • Examples include: genetics, age, sedentary lifestyles, smoking, stress, environmental pollutants.

Dietary Patterns and Diseases

  • Western Diet Impact:

    • Promotes high rates of overweight/obesity leading to serious health complications:

      • Atherosclerosis

      • Heart disease

      • Kidney failure

Leading Causes of Death in Canada

  • 2011 Statistics Overview:

    • Total deaths: 242,074

    • Leading causes categorized by sex include:

      1. Malignant neoplasms (cancer): 29.9%

      2. Heart disease: 19.7%

      3. Stroke: 5.5%

      4. Chronic lower respiratory diseases: 4.6%

      5. Accidental injuries: 4.4%

      6. Diabetes: 3%

  • Additional Causes: Alzheimer's, influenza, suicide, kidney diseases.

Obesity in Canada

  • BMI Classifications:

    • <18.5: At risk

    • 18.5-24.9: Healthy

    • 25-29.9: Overweight

    • 30: Obese

  • Statistics:

    • Adults: 61% (37% overweight + 24% obese)

    • Children: 26% (17% overweight + 9% obese)

Trends in Diet

  • Historical Diet Changes:

    • Comparison of fat, sugar, protein, starch, salt, and fiber content across hunter-gatherer, peasant, agriculturist, and modern affluent societies.

  • Current Dietary Concerns:

    • Increasing reliance on ultra-processed foods affecting diet quality.

Nutrition Research Methodology

  • Identifying Nutrition Truths:

    • Scientific knowledge acquired through systematic studies including human trials, cellular, and animal models.

  • Quality of Experiments:

    • Requires quantifiable data, appropriate controls, and an unbiased approach to explore food and nutrient interactions.

Importance of Scientific Evidence in Nutrition

  • Research Impact:

    • Evidence-based guidelines shape public health through proper nutrition understanding.

Nutrition Misinformation and Media

  • Challenges:

    • Misinformation arises from profit-driven motives and media oversimplification of complex topics.

  • Identifying Nutritional Quackery:

    • Features include overly good-to-be-true claims, lack of citations, and personal gain motives.

Validating Nutrition Experts

  • Registered Dietitians/Nutritionists:

    • Translate complex information into practical diets and plans.

    • Must hold a B.Sc. in Nutrition, complete an internship, and pass the national licensing examination.

Reliable Sources of Nutrition Information

  • Government Agencies:

    • Health Canada, Canada Food Inspection Agency, Public Health Agency of Canada.

  • Non-Profit Organizations:

    • Dietitians of Canada, Canadian Medical Association, Heart and Stroke Foundation.

  • Educational Institutions:

    • Universities and peer-reviewed journals.

  • Scientific Organizations:

    • Examples include the Canadian Nutrition Society.