J Acad Nutr Diet. 2023 Aug 22:S2212-2672(23)01490-9. doi: 10.1016/j.jand.2023.08.127. Online ahead of print.
ABSTRACT
BACKGROUND: Inflammatory and prothrombotic responses are hallmark to the progression of cardiovascular disease (CVD) and may be influenced by the type of dietary fat. Cottonseed oil (CSO) is rich in omega-6 polyunsaturated fats (n-6 PUFA) and improves traditional CVD risk factors such as cholesterol profiles. However, some clinicians are still hesitant to promote n-6 PUFA consumption despite growing evidence suggesting they may not be independently pro-inflammatory.
OBJECTIVE: To investigate the inflammatory and coagulation marker responses to an 8-week diet intervention rich in either CSO or olive oil (OO; monounsaturated fat rich) in adults with untreated hypercholesterolemia.
DESIGN: This was a secondary analysis of a parallel-arm randomized clinical trial with the main outcome of cholesterol measures.
PARTICIPANTS: /setting: Participants included in this analysis were 42 sedentary adults age 30-75 (62% female) in the Athens, GA area, between May 2018 and June 2021, with untreated hypercholesterolemia or elevated blood lipids and BMIs >18.5. Hypercholesterolemia was defined as at least two blood lipids in a “borderline undesirable/at risk” range (total cholesterol (TC) ≥ 180 mg/dL, Low-density lipoprotein cholesterol (LDL-c) ≥ 110 mg/dl, high-density lipoprotein cholesterol (HDL-c) < 50 mg/dL, or triglycerides (TG) ≥ 130), or at least one in an “undesirable” range (TC ≥ 240 mg/dL, LDL-c ≥ 160 mg/dl, HDL-c< 40 mg/dL, or TG ≥ 200).
INTERVENTION: Participants were randomly assigned to either the CSO or OO group in a partial outpatient feeding trial. Meals from the study provided approximately 60% of their energy needs with 30% of energy needs from either CSO or OO for eight weeks. Participants fulfilled their remaining energy needs with meals of their choosing.
MAIN OUTCOME MEASURES: Fasting plasma concentrations of inflammatory markers including C-reactive protein (CRP), tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and interleukin-1β (IL-1β) were measured at baseline and 8-weeks. Markers of coagulation potential including plasminogen activator inhibitor-1 (PAI-1), and tissue factor (TF) were measured at the same time points.
STATISTICAL ANALYSES PERFORMED: Repeated measures linear mixed models were used with treatment and visit in the model for analyses of all biochemical markers.
RESULTS: There were no significant differences in fasting CRP (p=0.70), TNF-α (p=0.98), IL-6 (p=0.21), IL-1β (p=0.13), PAI-1 (p=0.29), or TF (p=0.29) between groups across the intervention.
CONCLUSION: Inflammation and coagulation marker responses to diets rich in CSO vs. OO were not significantly different between groups, and neither group showed changes in these markers in adults with untreated hypercholesterolemia. This provides additional evidence suggesting that dietary n-6 PUFAs may not promote inflammation compared to MUFAs, even in adults at increased risk for CVD.
PMID:37619782 | DOI:10.1016/j.jand.2023.08.127