The Associations Between Habitual Dietary Fat Intake and Inflammatory Markers Among Marathon Runners: An Exploratory...

Area of Science:

• Exercise immunology
• Nutritional science
• Inflammation research

Background:

• Marathon running induces a significant inflammatory response.
• The influence of dietary fat composition on exercise-induced inflammation is not well understood.

Purpose of the Study:

• To investigate if habitual dietary fat intake modulates pre-race cytokine levels and post-marathon inflammatory response.
• To explore associations between specific dietary fatty acids and inflammatory markers.

Main Methods:

• Thirty-one marathon runners completed a dietary assessment for habitual fat intake.
• Cytokine levels (IFN-γ, IL-1β, IL-4, IL-6, IL-10, TNF-α) were measured pre-race, immediately post-race, and 48 hours post-race.
• Statistical analyses included repeated measures ANOVA and multivariable regression with FDR correction.

Main Results:

• Interleukin-6 (IL-6) and Interleukin-10 (IL-10) increased significantly post-race, returning to baseline by 48 hours.
• Monounsaturated fatty acid (MFA) 20:1 intake was positively associated with higher Interferon-gamma (IFN-γ) and Tumor Necrosis Factor-alpha (TNF-α) at 48 hours post-race.
• No significant changes were observed for IFN-γ, IL-1β, or IL-4, and TNF-α showed a borderline trend.

Conclusions:

• Habitual intake of MFA 20:1 is associated with elevated IFN-γ and TNF-α 48 hours post-marathon.
• The post-race recovery period may be critical for observing the impact of dietary fat quality on inflammation.
• Dietary fat quality warrants consideration in future endurance recovery nutrition strategies.