The impact of MTHFR 677C → T risk knowledge on changes in folate intake: findings from the Food4Me study

Clare B O'Donovan, Marianne C Walsh, Hannah Forster, Clara Woolhead, Carlos Celis-Morales, Rosalind Fallaize, Anna L Macready, Cyril F M Marsaux, Santiago Navas-Carretero, Rodrigo San-Cristobal, Silvia Kolossa, Christina Mavrogianni, Christina P Lambrinou, George Moschonis, Magdalena Godlewska, Agnieszka Surwillo, Jildau Bouwman, Keith Grimaldi, Iwona Traczyk, Christian A Drevon, Hannelore Daniel, Yannis Manios, J Alfredo Martinez, Wim H M Saris, Julie A Lovegrove, John C Mathers, Michael J Gibney, Lorraine Brennan, Eileen R Gibney, Clare B O'Donovan, Marianne C Walsh, Hannah Forster, Clara Woolhead, Carlos Celis-Morales, Rosalind Fallaize, Anna L Macready, Cyril F M Marsaux, Santiago Navas-Carretero, Rodrigo San-Cristobal, Silvia Kolossa, Christina Mavrogianni, Christina P Lambrinou, George Moschonis, Magdalena Godlewska, Agnieszka Surwillo, Jildau Bouwman, Keith Grimaldi, Iwona Traczyk, Christian A Drevon, Hannelore Daniel, Yannis Manios, J Alfredo Martinez, Wim H M Saris, Julie A Lovegrove, John C Mathers, Michael J Gibney, Lorraine Brennan, Eileen R Gibney

Abstract

Background: It is hypothesised that individuals with knowledge of their genetic risk are more likely to make health-promoting dietary and lifestyle changes. The present study aims to test this hypothesis using data from the Food4Me study. This was a 6-month Internet-based randomised controlled trial conducted across seven centres in Europe where individuals received either general healthy eating advice or varying levels of personalised nutrition advice. Participants who received genotype-based personalised advice were informed whether they had the risk (CT/TT) (n = 178) or non-risk (CC) (n = 141) alleles of the methylenetetrahydrofolate reductase (MTHFR) gene in relation to cardiovascular health and the importance of a sufficient intake of folate. General linear model analysis was used to assess changes in folate intake between the MTHFR risk, MTHFR non-risk and control groups from baseline to month 6 of the intervention.

Results: There were no differences between the groups for age, gender or BMI. However, there was a significant difference in country distribution between the groups (p = 0.010). Baseline folate intakes were 412 ± 172, 391 ± 190 and 410 ± 186 μg per 10 MJ for the risk, non-risk and control groups, respectively. There were no significant differences between the three groups in terms of changes in folate intakes from baseline to month 6. Similarly, there were no changes in reported intake of food groups high in folate.

Conclusions: These results suggest that knowledge of MTHFR 677C → T genotype did not improve folate intake in participants with the risk variant compared with those with the non-risk variant.

Trial registration: ClinicalTrials.gov NCT01530139.

Keywords: Folate; Genetic risk knowledge; MTHFR; Methylenetetrahydrofolate reductase 677C → T genotype; Personalised nutrition.

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