TY - JOUR
T1 - Differences in the prospective association between individual plasma phospholipid saturated fatty acids and incident type 2 diabetes
T2 - The EPIC-InterAct case-cohort study
AU - Forouhi, Nita G.
AU - Koulman, Albert
AU - Sharp, Stephen J.
AU - Imamura, Fumiaki
AU - Kröger, Janine
AU - Schulze, Matthias B.
AU - Crowe, Francesca L.
AU - Huerta, José María
AU - Guevara, Marcela
AU - Beulens, Joline W.J.
AU - van Woudenbergh, Geertruida J.
AU - Wang, Laura
AU - Summerhill, Keith
AU - Griffin, Julian L.
AU - Feskens, Edith J.M.
AU - Amiano, Pilar
AU - Boeing, Heiner
AU - Clavel-Chapelon, Françoise
AU - Dartois, Laureen
AU - Fagherazzi, Guy
AU - Franks, Paul W.
AU - Gonzalez, Carlos
AU - Jakobsen, Marianne Uhre
AU - Kaaks, Rudolf
AU - Key, Timothy J.
AU - Khaw, Kay Tee
AU - Kühn, Tilman
AU - Mattiello, Amalia
AU - Nilsson, Peter M.
AU - Overvad, Kim
AU - Pala, Valeria
AU - Palli, Domenico
AU - Quirós, J. Ramón
AU - Rolandsson, Olov
AU - Roswall, Nina
AU - Sacerdote, Carlotta
AU - Sánchez, María José
AU - Slimani, Nadia
AU - Spijkerman, Annemieke M.W.
AU - Tjonneland, Anne
AU - Tormo, Maria José
AU - Tumino, Rosario
AU - van der A, Daphne L.
AU - van der Schouw, Yvonne T.
AU - Langenberg, Claudia
AU - Riboli, Elio
AU - Wareham, Nicholas J.
PY - 2014/1/1
Y1 - 2014/1/1
N2 - Background: Conflicting evidence exists regarding the association between saturated fatty acids (SFAs) and type 2 diabetes. In this longitudinal case-cohort study, we aimed to investigate the prospective associations between objectively measured individual plasma phospholipid SFAs and incident type 2 diabetes in EPIC-InterAct participants. Methods: The EPIC-InterAct case-cohort study includes 12 403 people with incident type 2 diabetes and a representative subcohort of 16 154 individuals who were selected from a cohort of 340 234 European participants with 3·99 million person-years of follow-up (the EPIC study). Incident type 2 diabetes was ascertained until Dec 31, 2007, by a review of several sources of evidence. Gas chromatography was used to measure the distribution of fatty acids in plasma phospholipids (mol%); samples from people with type 2 diabetes and subcohort participants were processed in a random order by centre, and laboratory staff were masked to participant characteristics. We estimated country-specific hazard ratios (HRs) for associations per SD of each SFA with incident type 2 diabetes using Prentice-weighted Cox regression, which is weighted for case-cohort sampling, and pooled our findings using random-effects meta-analysis. Findings: SFAs accounted for 46% of total plasma phospholipid fatty acids. In adjusted analyses, different individual SFAs were associated with incident type 2 diabetes in opposing directions. Even-chain SFAs that were measured (14:0 [myristic acid], 16:0 [palmitic acid], and 18:0 [stearic acid]) were positively associated with incident type 2 diabetes (HR [95% CI] per SD difference: myristic acid 1·15 [95% CI 1·09-1·22], palmitic acid 1·26 [1·15-1·37], and stearic acid 1·06 [1·00-1·13]). By contrast, measured odd-chain SFAs (15:0 [pentadecanoic acid] and 17:0 [heptadecanoic acid]) were inversely associated with incident type 2 diabetes (HR [95% CI] per 1 SD difference: 0·79 [0·73-0·85] for pentadecanoic acid and 0·67 [0·63-0·71] for heptadecanoic acid), as were measured longer-chain SFAs (20:0 [arachidic acid], 22:0 [behenic acid], 23:0 [tricosanoic acid], and 24:0 [lignoceric acid]), with HRs ranging from 0·72 to 0·81 (95% CIs ranging between 0·61 and 0·92). Our findings were robust to a range of sensitivity analyses. Interpretation: Different individual plasma phospholipid SFAs were associated with incident type 2 diabetes in opposite directions, which suggests that SFAs are not homogeneous in their effects. Our findings emphasise the importance of the recognition of subtypes of these fatty acids. An improved understanding of differences in sources of individual SFAs from dietary intake versus endogenous metabolism is needed.
AB - Background: Conflicting evidence exists regarding the association between saturated fatty acids (SFAs) and type 2 diabetes. In this longitudinal case-cohort study, we aimed to investigate the prospective associations between objectively measured individual plasma phospholipid SFAs and incident type 2 diabetes in EPIC-InterAct participants. Methods: The EPIC-InterAct case-cohort study includes 12 403 people with incident type 2 diabetes and a representative subcohort of 16 154 individuals who were selected from a cohort of 340 234 European participants with 3·99 million person-years of follow-up (the EPIC study). Incident type 2 diabetes was ascertained until Dec 31, 2007, by a review of several sources of evidence. Gas chromatography was used to measure the distribution of fatty acids in plasma phospholipids (mol%); samples from people with type 2 diabetes and subcohort participants were processed in a random order by centre, and laboratory staff were masked to participant characteristics. We estimated country-specific hazard ratios (HRs) for associations per SD of each SFA with incident type 2 diabetes using Prentice-weighted Cox regression, which is weighted for case-cohort sampling, and pooled our findings using random-effects meta-analysis. Findings: SFAs accounted for 46% of total plasma phospholipid fatty acids. In adjusted analyses, different individual SFAs were associated with incident type 2 diabetes in opposing directions. Even-chain SFAs that were measured (14:0 [myristic acid], 16:0 [palmitic acid], and 18:0 [stearic acid]) were positively associated with incident type 2 diabetes (HR [95% CI] per SD difference: myristic acid 1·15 [95% CI 1·09-1·22], palmitic acid 1·26 [1·15-1·37], and stearic acid 1·06 [1·00-1·13]). By contrast, measured odd-chain SFAs (15:0 [pentadecanoic acid] and 17:0 [heptadecanoic acid]) were inversely associated with incident type 2 diabetes (HR [95% CI] per 1 SD difference: 0·79 [0·73-0·85] for pentadecanoic acid and 0·67 [0·63-0·71] for heptadecanoic acid), as were measured longer-chain SFAs (20:0 [arachidic acid], 22:0 [behenic acid], 23:0 [tricosanoic acid], and 24:0 [lignoceric acid]), with HRs ranging from 0·72 to 0·81 (95% CIs ranging between 0·61 and 0·92). Our findings were robust to a range of sensitivity analyses. Interpretation: Different individual plasma phospholipid SFAs were associated with incident type 2 diabetes in opposite directions, which suggests that SFAs are not homogeneous in their effects. Our findings emphasise the importance of the recognition of subtypes of these fatty acids. An improved understanding of differences in sources of individual SFAs from dietary intake versus endogenous metabolism is needed.
UR - http://www.scopus.com/inward/record.url?scp=84922235687&partnerID=8YFLogxK
U2 - https://doi.org/10.1016/S2213-8587(14)70146-9
DO - https://doi.org/10.1016/S2213-8587(14)70146-9
M3 - Article
C2 - 25107467
SN - 2213-8587
VL - 2
SP - 810
EP - 818
JO - The Lancet Diabetes and Endocrinology
JF - The Lancet Diabetes and Endocrinology
IS - 10
ER -