The Effects of L-Carnitine Supplementation on Serum Lipids: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

2019 ◽  
Vol 25 (30) ◽  
pp. 3266-3281 ◽  
Author(s):  
Hadis Fathizadeh ◽  
Alireza Milajerdi ◽  
Željko Reiner ◽  
Fariba Kolahdooz ◽  
Maryam Chamani ◽  
...  
Keyword(s):  
Serum Lipids ◽  
Ldl Cholesterol ◽  
Meta Analysis ◽  
Hdl Cholesterol ◽  
Health Conditions ◽  
Carnitine Supplementation ◽  
Randomized Controlled ◽  
Cholesterol Levels ◽  
Vldl Cholesterol ◽  
Subgroup Analyses

Background: The findings of trials investigating the effects of L-carnitine administration on serum lipids are inconsistent. This meta-analysis of randomized controlled trials (RCTs) was performed to summarize the effects of L-carnitine intake on serum lipids in patients and healthy individuals. Methods: Two authors independently searched electronic databases including MEDLINE, EMBASE, Cochrane Library, Web of Science, PubMed and Google Scholar from 1990 until August 1, 2019, in order to find relevant RCTs. The quality of selected RCTs was evaluated using the Cochrane Collaboration risk of bias tool. Cochrane’s Q test and I-square (I2) statistic were used to determine the heterogeneity across included trials. Weight mean difference (SMD) and 95% CI between the two intervention groups were used to determine pooled effect sizes. Subgroup analyses were performed to evaluate the source of heterogeneity based on suspected variables such as, participant’s health conditions, age, dosage of L-carnitine, duration of study, sample size, and study location between primary RCTs. Results: Out of 3460 potential papers selected based on keywords search, 67 studies met the inclusion criteria and were eligible for the meta-analysis. The pooled results indicated that L-carnitine administration led to a significant decrease in triglycerides (WMD: -10.35; 95% CI: -16.43, -4.27), total cholesterol (WMD: -9.47; 95% CI: - 13.23, -5.70) and LDL-cholesterol (LDL-C) concentrations (WMD: -6.25; 95% CI: -9.30, -3.21), and a significant increase in HDL-cholesterol (HDL-C) levels (WMD: 1.39; 95% CI: 0.21, 2.57). L-carnitine supplementation did not influence VLDL-cholesterol concentrations. When we stratified studies for the predefined factors such as dosage, and age, no significant effects of the intervention on triglycerides, LDL-C, and HDL-C levels were found. Conclusion: This meta-analysis demonstrated that L-carnitine administration significantly reduced triglycerides, total cholesterol and LDL-cholesterol levels, and significantly increased HDL-cholesterol levels in the pooled analyses, but did not affect VLDL-cholesterol levels; however, these findings were not confirmed in our subgroup analyses by participant’s health conditions, age, dosage of L-carnitine, duration of study, sample size, and study location.

The Effects of Vitamin D Supplementation on Glucose Metabolism and Lipid Profiles in Patients with Gestational Diabetes: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

2017 ◽  
Vol 49 (09) ◽  
pp. 647-653 ◽  
Author(s):  
Maryam Akbari ◽  
Mahmood Mosazadeh ◽  
Kamran Lankarani ◽  
Reza Tabrizi ◽  
Mansooreh Samimi ◽  
...  
Keyword(s):  
Systematic Review ◽  
Vitamin D ◽  
Ldl Cholesterol ◽  
Meta Analysis ◽  
Hdl Cholesterol ◽  
Vitamin D Supplementation ◽  
Controlled Trials ◽  
Model Assessment ◽  
Randomized Controlled ◽  
Cholesterol Levels

AbstractThis systematic review and meta-analysis of randomized controlled trials (RCTs) was conducted to summarize the effect of vitamin D supplementation on glucose homeostasis parameters and lipid profiles in gestational diabetes (GDM) patients. We conducted an electronic systematic search of MEDLINE, and 4 other research databases from inception to August 2016, in addition to performing hand searches and consulting with experts in the field. The index of heterogeneity between studies was determined using Cochran (Q) and I-squared tests. Given the existing heterogeneity between studies, a fix or random effect model was performed to estimate the standardized mean difference (SMD) for each variable by using inverse variance method and Cohen statistics. Six randomized clinical trials (187 subjects and 184 controls) were included. The results showed that vitamin D supplementation significantly reduced the homeostasis model assessment of insulin resistance (HOMA-IR) [SMD −0.66; 95% confidence interval (CI), −1.14 to −0.18], homeostatic model assessment-B cell function (HOMA-B) (SMD −0.52; 95% CI, −0.79 to −0.25), LDL-cholesterol levels (SMD −0.33; 95% CI, −0.58 to −0.07), and significantly increased quantitative insulin sensitivity check index (QUICKI) (SMD 0.73; 95% CI, 0.26 to 1.20). We found no beneficial effect of vitamin D supplementation on fasting plasma glucose (FPG), insulin, HbA1c, total-, HDL-cholesterol, and triglycerides concentrations. In conclusion, this meta-analysis demonstrated that vitamin D supplementation may lead to an improvement in HOMA-IR, QUICKI, and LDL-cholesterol levels, but did not affect FPG, insulin, HbA1c, triglycerides, total- and HDL-cholesterol levels; however, vitamin D supplementation increased HOMA-B.

scholarly journals Effects of yoghurt enriched with plant sterols on serum lipids in patients with moderate hypercholesterolaemia

2001 ◽  
Vol 86 (2) ◽  
pp. 233-239 ◽  
Author(s):  
Robert Volpe ◽  
Leena Niittynen ◽  
Riitta Korpela ◽  
Cesare Sirtori ◽  
Antonello Bucci ◽  
...  
Keyword(s):  
Total Cholesterol ◽  
Serum Lipids ◽  
Ldl Cholesterol ◽  
Hdl Cholesterol ◽  
Plant Sterols ◽  
Dependent Manner ◽  
Low Fat ◽  
Treatment Groups ◽  
Cholesterol Levels ◽  
Dose Dependent

The objective of the present study was to assess the effect of consumption of a yoghurt-based drink enriched with 1–2 g plant sterols/d on serum lipids, transaminases, vitamins and hormone status in patients with primary moderate hypercholesterolaemia. Thirty patients were randomly assigned to one of two treatment groups: a low-fat low-lactose yoghurt-based drink enriched with 1 g plant sterol extracted from soyabean/dv.a low-fat low-lactose yoghurt, for a period of 4 weeks. After a 2-week wash-out period, patients were crossed over for an additional 4-week period. Second, after a 4-week wash-out period, eleven patients were treated with 2 g plant sterols/d in a second open part of the study for a period of 8 weeks. The yoghurt enriched with plant sterols significantly reduced, in a dose-dependent manner, serum total cholesterol and LDL-cholesterol levels and LDL-cholesterol:HDL-cholesterol (P<0·001), whereas no changes were observed in HDL-cholesterol and triacylglycerol levels, either in the first or the second part of the study. There were only slight, not statistically significant, differences in serum transaminase, vitamin and hormone levels. To conclude, a low-fat yoghurt-based drink moderately enriched with plant sterols may lower total cholesterol and LDL-cholesterol effectively in patients with primary moderate hypercholesterolaemia.

Abstract MP66: Cheese Consumption and Blood Lipids; a Systematic Review and Meta-analysis of Randomized Controlled Trials

Circulation ◽  
2014 ◽  
Vol 129 (suppl_1) ◽  
Author(s):  
Janette de Goede ◽  
Johanna M Geleijnse ◽  
Eric L Ding ◽  
Sabita S. Soedamah-Muthu
Keyword(s):  
Total Cholesterol ◽  
Blood Lipids ◽  
Ldl Cholesterol ◽  
Meta Analysis ◽  
Hdl Cholesterol ◽  
Fat Content ◽  
Control Treatment ◽  
Controlled Trials ◽  
Randomized Controlled ◽  
Lipids And Lipoproteins

Aims: Cheese may have a different effect on lipids and lipoproteins than expected from the saturated fat content. We performed a systematic review and meta-analysis of randomized controlled trials (RCTs) to examine the effect of cheese consumption on blood lipids and lipoproteins in healthy populations. Methods: A systematic search in MEDLINE, EMBASE, Scopus, Cababstracts, Cochrane Controlled Trials Register, Clinicaltrials.gov was performed to identify RCTs of cheese supplementation in human adults with total cholesterol, LDL-cholesterol, HDL-cholesterol, triglycerides as a primary or secondary outcome (published until September 2013). A quantitative meta-analysis was performed if more than four RCTs with a comparable control treatment were available. Within person-differences of lipids with corresponding standard errors caused by the cheese compared to the control treatment were pooled (random effects model, STATA 11.0). Results: We identified 15 RCTs, published between 1978 and 2012. We pooled four RCTs comparing the effect of cheese intake to butter with a similar fat content on plasma levels of total cholesterol, LDL-cholesterol, HDL-cholesterol and triglycerides. The amount of cheese used in these trials was rather large, ranging between 120 and 205 g/d. This is approximately equivalent to 3 to 5 cheese servings per day. Intake of cheese (weighted mean difference: 142.6 g/d) reduced total cholesterol significantly by -0.27 mmol/l (95% CI: -0.36 to -0.18), LDL-C by -0.21 mmol/l (95% CI: -0.29 to -0.13), and HDL-C by -0.05 (95% CI: -0.08 to -0.02) compared to butter. The pooled effect on triglycerides was 0.004 (95% CI: -0.058 to 0.065). No heterogeneity was observed (all I 2 =0%). Cheese was also compared with tofu (n=4 RCTs), fat-modified cheese (n=3), CLA-rich cheese (n=3), milk (n=2), fish (n=1), egg white (n=1). Trials that compared cheese with tofu or fat-modified cheese suggest that differential effects of the products can mainly be attributed to the differences in fatty acid content of the diets. Comparisons with CLA-rich cheese were of limited value because those studied the effects of CLA (and not cheese). Too few trials with milk, egg white, and fish were available to draw conclusions. Conclusions: Based on a limited number of trials, cheese appears less hypercholesterolemic than butter with a similar fat content. Differences in plasma lipids based on cheese compared with tofu and fat-modified products are likely to be caused by the different fat content of the total diets.

scholarly journals The association between serum lipids and colorectal neoplasm: a systemic review and meta-analysis

2015 ◽  
Vol 18 (18) ◽  
pp. 3355-3370 ◽  
Author(s):  
Yun Tian ◽  
Keming Wang ◽  
Juan Li ◽  
Jirong Wang ◽  
Zhaoxia Wang ◽  
...  
Keyword(s):  
Serum Lipids ◽  
Ldl Cholesterol ◽  
Citation Index ◽  
Colorectal Neoplasm ◽  
Colorectal Neoplasia ◽  
Meta Analysis ◽  
Hdl Cholesterol ◽  
Systemic Review ◽  
Increased Risk ◽  
The Relationship

AbstractObjectiveThere have been inconsistent results published regarding the relationship between dyslipidaemia and an increased risk of colorectal neoplasia (CRN), including colorectal adenoma (CRA) and colorectal cancer (CRC). We conducted a meta-analysis to explore the relationship between dyslipidaemia and CRN.DesignWe identified studies by performing a literature search using PubMed, EMBASE and the Science Citation Index through October 2013.SettingWe analysed thirty-three independent studies reporting the association between CRN and at least one of the selected lipid components, including total cholesterol (TC), TAG, HDL-cholesterol (HDL-C) and LDL-cholesterol (LDL-C).SubjectsCRN cases (n 21 809) were identified.ResultsOverall, people with high levels of serum TAG (risk ratio (RR)=1·08; 95 % CI 1·05, 1·12, P<0·00001) and LDL-C (RR=1·07; 95 % CI 1·00, 1·14, P=0·04) presented an increased prevalence of CRN. Subgroup analyses revealed that high levels of serum TC (RR=1·04; 95 % CI 1·01, 1·09, P=0·02), TAG (RR=1·06; 95 % CI 1·03, 1·10, P=0·0009) and LDL-C (RR=1·11; 95 % CI 1·04, 1·19, P=0·003) increased the risk of CRA but not of CRC. No association between serum HDL-C and risk for CRN (including CRA and CRC) was observed.ConclusionsBoth TAG and LDL-C were significantly associated with an increasing prevalence of CRN. High levels of serum TC, TAG and LDL-C were positively associated with CRA but not with CRC. No significant association was observed between levels of serum HDL-C and CRN.

scholarly journals Effect of psyllium (Plantago ovata) fiber on LDL cholesterol and alternative lipid targets, non-HDL cholesterol and apolipoprotein B: a systematic review and meta-analysis of randomized controlled trials

2018 ◽  
Vol 108 (5) ◽  
pp. 922-932 ◽  
Author(s):  
Elena Jovanovski ◽  
Shahen Yashpal ◽  
Allison Komishon ◽  
Andreea Zurbau ◽  
Sonia Blanco Mejia ◽  
...  
Keyword(s):  
Randomized Controlled Trials ◽  
Apolipoprotein B ◽  
Ldl Cholesterol ◽  
Meta Analysis ◽  
Hdl Cholesterol ◽  
Controlled Trials ◽  
Cochrane Central Register ◽  
Cvd Risk ◽  
Randomized Controlled ◽  
Evaluation Approach

ABSTRACT Background Studies have identified viscous dietary fiber as potentially attenuating cholesterol, including psyllium, which reduces LDL cholesterol and thus may complement cardiovascular disease (CVD) treatment. Objectives The aims of this study were to update evidence on the effect of psyllium on LDL cholesterol and to provide an assessment of its impact on alternate markers: non-HDL cholesterol and apolipoprotein B (apoB). Design Medline, EMBASE, CINAHL, and the Cochrane Central Register of Controlled Trials were searched through 3 October 2017. Independent reviewers extracted relevant data and assessed risk of bias. We included randomized controlled trials with a duration of ≥3 wk that assessed the effect of psyllium on blood lipids in individuals with or without hypercholesterolemia. Data were pooled by using the generic inverse variance method with random-effects models and expressed as mean differences (MDs) with 95% CIs. Heterogeneity was assessed by Cochran's Q statistic and quantified by the I2 statistic. Overall quality of the evidence was assessed by using the GRADE (Grading of Recommendations Assessment, Development, and Evaluation) approach. Results We included 28 trials in our analysis (n = 1924). Supplementation of a median dose of ∼10.2 g psyllium significantly reduced LDL cholesterol (MD = –0.33 mmol/L; 95% CI: –0.38, –0.27 mmol/L; P < 0.00001), non-HDL cholesterol (MD = –0.39 mmol/L; 95% CI: –0.50, –0.27 mmol/L; P < 0.00001), and apoB (MD = –0.05 g/L; 95% CI: –0.08, –0.03 g/L; P < 0.0001). Effect estimates for LDL cholesterol and non-HDL cholesterol were graded as moderate quality on the basis of downgrades for inconsistency and graded as high quality for apoB. Conclusion Psyllium fiber effectively improves conventional and alternative lipids markers, potentially delaying the process of atherosclerosis-associated CVD risk in those with or without hypercholesterolemia. This trial is registered at www.clinicaltrials.gov as NCT03346733.

The Effects of Curcumin on Glycemic Control and Lipid Profiles Among Patients with Metabolic Syndrome and Related Disorders: A Systematic Review and Metaanalysis of Randomized Controlled Trials

2018 ◽  
Vol 24 (27) ◽  
pp. 3184-3199 ◽  
Author(s):  
Reza Tabrizi ◽  
Sina Vakili ◽  
Kamran B. Lankarani ◽  
Maryam Akbari ◽  
Naghmeh Mirhosseini ◽  
...  
Keyword(s):  
Systematic Review ◽  
Metabolic Syndrome ◽  
Glycemic Control ◽  
Total Cholesterol ◽  
Fasting Glucose ◽  
Meta Analysis ◽  
Hdl Cholesterol ◽  
Controlled Trials ◽  
Randomized Controlled ◽  
Cholesterol Levels

Background: This systematic review and meta-analysis of randomized controlled trials (RCTs), were performed to determine the effects of curcumin intake on glycemic control and lipid profiles among patients with metabolic syndrome (MetS) and related disorders. Methods: We searched the following databases up until January 2018: MEDLINE, EMBASE, Web of Science, and Cochrane Central Register of Controlled Trials. The relevant data were extracted and evaluated for quality of the studies in accordance with the Cochrane risk of bias tool. Data were pooled using the inverse variance method and expressed as standardized mean difference (MDs) with 95% confidence intervals (95% CI). Results: Twenty-six trials with 1890 participants were included in the current meta-analysis. The findings demonstrated the significant association between curcumin intake and reduced fasting glucose levels (SMD -0.78; 95% CI, -1.20, -0.37; P<0.001), homeostasis model of assessment-estimated insulin resistance (SMD -0.91; 95% CI, -1.52, -0.31; P=0.003) and HbA1c (SMD -0.92; 95% CI, -1.37, -0.47; P<0.001). In addition, curcumin supplementation was significantly associated with triglyceride (SMD -1.21; 95 % CI, -1.78, -0.65; P<0.001) and total cholesterol reduction (SMD -0.73; 95 % CI, -1.32, -0.13; P= 0.01). However, curcumin intake significantly increased insulin levels (SMD 0.92; 95% CI, 0.06, 1.78; P=0.036). We found no significant effect of curcumin supplementation on LDL- (SMD -0.52; 95% CI, -1.14, 0.11; P=0.10) and HDL-cholesterol levels (SMD 0.28; 95% CI, -0.22, 0.77; P=0.27). Conclusion: Overall, curcumin consumption was associated with a significant reduction in fasting glucose, HOMA-IR, HbA1c, triglycerides and total cholesterol levels among patients with MetS and related disorders, but did not affect LDL- and HDL-cholesterol levels.

scholarly journals Cholesterol and triglyceride levels in first-episode psychosis: systematic review and meta-analysis

2017 ◽  
Vol 211 (6) ◽  
pp. 339-349 ◽  
Author(s):  
Toby Pillinger ◽  
Katherine Beck ◽  
Brendon Stubbs ◽  
Oliver D. Howes
Keyword(s):  
Total Cholesterol ◽  
Ldl Cholesterol ◽  
Meta Analysis ◽  
Density Lipoprotein ◽  
Hdl Cholesterol ◽  
First Episode Psychosis ◽  
First Episode ◽  
Absolute Increase ◽  
Cholesterol Levels ◽  
Episode Psychosis

BackgroundThe extent of metabolic and lipid changes in first-episode psychosis (FEP) is unclear.AimsTo investigate whether individuals with FEP and no or minimal antipsychotic exposure show lipid and adipocytokine abnormalities compared with healthy controls.MethodWe conducted a meta-analysis of studies examining lipid and adipocytokine parameters in individuals with FEP and no or minimal antipsychotic exposurev.a healthy control group. Studies reported fasting total cholesterol, low-density lipoprotein (LDL) cholesterol, high-density lipoprotein (HDL) cholesterol, triglycerides and leptin levels.ResultsOf 2070 citations retrieved, 20 case–control studies met inclusion criteria including 1167 patients and 1184 controls. Total cholesterol and LDL cholesterol levels were significantly decreased in patientsv.controls, corresponding to an absolute reduction of 0.26mmol/L and 0.15mmol/L respectively. Triglyceride levels were significantly increased in the patient group, corresponding to an absolute increase of 0.08 mmol/L However, HDL cholesterol and leptin levels were not altered in patientsv.controls.ConclusionsTotal and LDL cholesterol levels are reduced in FEP, indicating that hypercholesterolaemia in patients with chronic disorder is secondary and potentially modifiable. In contrast, triglycerides are elevated in FEP. Hypertriglyceridaemia is a feature of type 2 diabetes mellitus, therefore this finding adds to the evidence for glucose dysregulation in this cohort. These findings support early intervention targeting nutrition, physical activity and appropriate antipsychotic prescription.

scholarly journals Serum lipid profile in dengue patients: a simple laboratory tool to predict disease severity

Biomedicine ◽  
2021 ◽  
Vol 41 (2) ◽  
pp. 227-232
Author(s):  
M. Thejaswini ◽  
Chandrashekar Udyavara Kudru ◽  
Shivashankara Kaniyoor Nagiri ◽  
Arpita Chakraborty ◽  
Vasudeva Guddattu
Keyword(s):  
Total Cholesterol ◽  
Disease Severity ◽  
Serum Lipid ◽  
Serum Lipids ◽  
Ldl Cholesterol ◽  
Hdl Cholesterol ◽  
Severe Dengue ◽  
Cholesterol Levels ◽  
Laboratory Tool ◽  
Lipid Parameters

Introduction and Aim: Serum lipids play a pivotal role in the immune response of the host during dengue. The aim of this study was to evaluate the serum lipid abnormalities in dengue patients and to study the relationship between serum lipids with disease severity and platelet count.   Materials and Methods: This case control study was carried out in 75 cases of dengue of age group > 18 years divided into three groups namely dengue without warning symptoms (DNWS), dengue with warning symptoms (DWWS) and severe dengue (SD) and 75 age and gender matched healthy controls. Lipid parameters such as total cholesterol, HDL cholesterol, LDL cholesterol and triglycerides were thereafter measured in all the subjects.   Results: Among 75 patients with dengue fever, 52 (69.4%) were classified as DNWS, 15 (20%) as DWWS and the remaining 8 (10.6%) as SD. Lower levels of serum total cholesterol (TC) levels (118.8 + 30.71) (p <0.0001) were observed among patients with DNWS when compared to controls. A strong significant positive correlation was seen between the platelets and serum HDL cholesterol levels among the subjects with SD (r = 0.712, p=.047*) and weak negative correlation was observed between the platelets and triglycerides in patients with dengue with warning signs (r = -0.275, p=.048*).   Conclusion: We observed a strong association of diminished TC, HDL and LDL cholesterol levels with the severity of dengue. Based on our findings, these three lipid parameters could be utilized as a simple laboratory tool to identify dengue severity in resource limited settings.

Effect of ascorbate on serum lipids and urate metabolism during exhaustive training

2004 ◽  
Vol 106 (1) ◽  
pp. 107-109 ◽  
Author(s):  
Hidekatsu YANAI ◽  
Mie MORIMOTO
Keyword(s):  
Placebo Group ◽  
Serum Lipids ◽  
Ldl Cholesterol ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Hdl Cholesterol ◽  
Serum Urate ◽  
Exhaustive Exercise ◽  
Controlled Study ◽  
Cholesterol Levels

Physical activity is associated with beneficial changes in serum lipids, but exhaustive exercise has been suggested to increase oxidative stress. To test the effect of ascorbate (vitamin C) on serum lipids and the metabolism of urate, which is the most important intrinsic antioxidant, during exhaustive exercise, we performed a randomized, blinded, placebo-controlled study on eight male well-trained athletes. subjects were randomly allocated to either a group given 1000 mg of ascorbate daily (n=4) or a placebo group (n=4). Fasting serum lipids and urate concentrations were measured before and after 3 weeks of training. Although serum low-density lipoprotein (LDL)-cholesterol levels decreased and high-density lipoprotein (HDL)-cholesterol levels increased significantly in the ascorbate group after the 3 weeks of training, serum LDL-cholesterol levels increased and HDL-cholesterol levels decreased significantly in the placebo group. Furthermore, serum urate levels were elevated significantly in the placebo group; however, these levels did not change in the ascorbate group. When compared with the placebo group, significantly higher serum HDL-cholesterol and lower serum LDL-cholesterol and urate levels were observed in the ascorbate group after training. In conclusion, our results suggested that ascorbate may contribute to the desirable changes in serum lipids during exhaustive training and suggest the significant association between ascorbate and urate under intense training.

scholarly journals Effect of green tea consumption on blood lipids: a systematic review and meta-analysis of randomized controlled trials

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Renfan Xu ◽  
Ke Yang ◽  
Sui Li ◽  
Meiyan Dai ◽  
Guangzhi Chen
Keyword(s):  
Publication Bias ◽  
Green Tea ◽  
Blood Lipids ◽  
Ldl Cholesterol ◽  
Meta Analysis ◽  
Density Lipoprotein ◽  
Hdl Cholesterol ◽  
Tea Consumption ◽  
Randomized Controlled ◽  
Funnel Plots

Abstract Background Strong epidemiologic evidence indicates that green tea intake is protective against hyperlipidemia; however, randomized controlled studies have presented varying results. In the present study, we aimed to conduct a literature review and meta-analysis to assess the effect of green tea on blood lipids. Methods PubMed, Embase, and the Cochrane Library were electronically explored from inception to September 2019 for all relevant studies. Random effect models were used to estimate blood lipid changes between green tea supplementation and control groups by evaluating the weighted mean differences (WMD) with 95% confidence intervals (CIs). The risk of bias for study was assessed using the Cochrane tool. Publication bias was evaluated using funnel plots and Egger’s tests. Results Thirty-one trials with a total of 3321 subjects were included in the meta-analysis. In general, green tea intake significantly lowered the total cholesterol (TC); WMD: − 4.66 mg/dL; 95% CI: − 6.36, − 2.96 mg/dL; P < 0.0001) and low-density lipoprotein (LDL) cholesterol (WMD:− 4.55 mg/dL; 95% CI: − 6.31, − 2.80 mg/dL; P < 0.0001) levels compared with those in the control. Green tea consumption did not affect high-density lipoprotein (HDL) cholesterol; however, it reduced the triglycerides compared with that in the control (WMD: − 3.77 mg/dL; 95% CI: − 8.90, 1.37 mg/dL; P = 0.15). In addition, significant publication bias from funnel plots or Egger’s tests was not evident. Conclusions Collectively, consumption of green tea lowers LDL cholesterol and TC, but not HDL cholesterol or triglycerides in both normal weight subjects and those who were overweight/obese; however, additional well-designed studies that include more diverse populations and longer duration are warranted.

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