Adherence to dietary recommendations and the risk of developing giant cell arteritis: A nested Case-Control study

Area of Science:

• Epidemiology
• Nutrition Science
• Rheumatology

Background:

• Giant cell arteritis (GCA) is a systemic vasculitis primarily affecting large arteries.
• Dietary patterns are increasingly recognized as modifiable factors influencing chronic disease risk.
• Understanding the relationship between diet and GCA may offer insights into disease prevention and pathogenesis.

Purpose of the Study:

• To examine the association between adherence to dietary recommendations and the risk of developing GCA.
• To investigate the impact of quantified intake of specific dietary components on GCA risk.

Main Methods:

• A case-control study nested within the Malmö Diet and Cancer Study cohort.
• 193 GCA cases were identified and matched with four controls each.
• Diet quality was assessed using the Swedish Dietary Guidelines Score (SDGS); logistic regression was used for analysis.

Main Results:

• High adherence to overall dietary guidelines (SDGS 4-5) was associated with a significantly increased risk of GCA (aOR 2.70).
• Adherence to recommendations for added sugar, fish, and vegetables/fruit was linked to higher GCA risk.
• Higher intake of added sugar showed a reduced risk, while higher fiber and fish/shellfish intake indicated increased risk.

Conclusions:

• Overall high diet quality, characterized by adherence to specific recommendations, was independently associated with an increased risk of GCA.
• Findings support the hypothesis that a healthy metabolic profile may be linked to a higher GCA risk.
• Metabolic regulation might play a role in the early stages of GCA pathogenesis.