NASM Guide on Understanding Food Allergies

Disclaimer

  • Content is for informational purposes only; not for diagnosis/treatment of medical conditions.

Welcome

  • Introduction from Dr. Brad Dieter on navigating food allergies and sensitivities.
  • Focus on differences between food allergies and sensitivities, diagnosis, and testing.
  • Objective: Empower individuals to understand body responses to food.

About NASM

  • The National Academy of Sports Medicine educates fitness and wellness professionals.
  • Provides up-to-date content on health-related topics applicable in practice.

Getting the Most from This Guide

  • Understand the complexities of food allergies and sensitivities.
  • Navigate scientific jargon easily with actionable key takeaways.

Introduction to Food Allergies

  • Growing prevalence and commercial interest in food allergies.
  • Lack of consumer education on food allergens and testing accuracy.

What Are Food Allergies?

  • Defined as an adverse health effect from an immune response to food.
  • Example: Lactose intolerance vs true food allergies (immune response vs metabolic issue).

Food Allergies vs. Food Sensitivities

  • Food Allergies: Immune response; severity varies with individual and allergen.
  • Food Sensitivities: Non-immune reactions; symptoms like GI distress without immune involvement.

Prevalence of Food Allergies

  • Approximately 11% of U.S. adults have a food allergy (Gupta et al., 2019).
  • Nearly 20% believe they have one.
  • Notably, many adults develop allergies later in life.

Demographic Disparities

  • Food allergies prevalence: Women (14%) vs Men (7.5%);
  • Higher rates in non-white populations (20-25%) vs white (10-12%).
  • Urban children have 4.5 times higher risk of allergies than rural peers.

Mental and Physical Health Effects

  • Food allergies can cause lifelong issues; adult-onset allergies rarely resolve.
  • Physical impacts: Anaphylaxis is rare but requires management, while other effects can be chronic GI distress.
  • Anaphylaxis: A severe allergic reaction that requires immediate treatment (epinephrine, antihistamines).
  • Psychological burden: Increased stress and anxiety among those with food allergies.

Detecting Food Allergies

  • Detection via allergy tests or food consumption; the latter is risky.

Testing Methods

Best Ways to Test Food Allergies

  • Increasing prevalence of food allergy tests; however, not all tests are reliable.

Immunology Basics

  • Immune system response to foreign proteins through IgE (allergy) and IgG (sensitivity).

IgE-Based Food Allergy Testing

  • Gold standard for identifying allergies; includes blood tests, clinical history, and oral challenges.
  • High sensitivity for common allergens (95-100% for eggs, milk, peanuts, etc.) but moderate specificity (30-60%).

IgG-Based Food Allergy Testing

  • Not recognized for diagnosing allergies; indicates exposure, not immune response.
  • High false positive rate; generally unreliable for true allergy diagnosis.

Conclusion

  • Self-reported food allergies have risen; however, education on allergies vs. sensitivities remains low.
  • Key points:
    • Food allergies = immune response; sensitivities = non-immune.
    • Tests have high false positive rates; even reputable blood tests require further validation.

Action Steps If You Suspect Allergies

  1. Avoid unreliable commercial tests; consult a specialist.
  2. Request clinically verified blood tests for allergies.
  3. Consider skin-prick tests for confirmation.
  4. Discuss oral food challenges with your physician for definitive diagnosis.

Online Resources

  • NASM Certified Nutrition Coach Certification (NASM-CNC)
  • NASM Blog & YouTube Channel for more nutrition insights.