Association of Dietary Fatty Acid Intake With the Development of Ulcerative Colitis: A Multicenter Case-Control Study...

Area of Science:

• Gastroenterology
• Nutritional Science
• Epidemiology

Background:

• Dietary fatty acids are implicated in chronic intestinal inflammation, including ulcerative colitis (UC).
• Previous research on fatty acids and UC risk is primarily from Western countries.
• Japanese dietary habits differ, featuring lower meat and higher fish consumption.

Purpose of the Study:

• To investigate the association between dietary fatty acid intake and the risk of developing ulcerative colitis in Japan.
• To explore how specific fatty acid ratios and individual fatty acids relate to UC risk in a Japanese population.

Main Methods:

• A multicenter case-control study involving 83 newly diagnosed UC patients and 128 matched controls.
• Dietary fatty acid intake was assessed for the preceding 1 month and 1 year using a Japanese diet history questionnaire.
• Data collection occurred between 2008 and 2014, with most UC patients experiencing initial symptoms within 11 months prior.

Main Results:

• A ratio of n-6/n-3 polyunsaturated fatty acids (PUFAs) ≥5.2 was associated with a significantly decreased risk for UC (OR=0.26).
• Conversely, high consumption of docosahexaenoic acid (DHA), eicosapentaenoic acid (EPA), and docosapentaenoic acid (DPA) correlated with an increased UC risk.
• Specific odds ratios for increased risk were: DHA (7.22), EPA (6.91), and DPA (4.83).

Conclusions:

• The ratio of n-6/n-3 PUFAs intake appears to be a significant factor in reducing UC development risk.
• High dietary intake of DHA, EPA, and DPA may be associated with an elevated risk of developing ulcerative colitis.
• Findings highlight the complex role of specific dietary fatty acids in UC pathogenesis within the Japanese population.