LGI and LGL diets reduce body weight, lipid profiles, and inflammatory markers in humansLow Glycemic Index Diets May Improve Weight and Cholesterol Levels

Frontiers in Medicine Published June 12, 2026 DOI ↗ Editorial oversight: Dr. Amelia Tan, PhD · Internal Medicine & Chronic Disease

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Key Takeaway

Note that LGI/LGL diets may improve metabolic markers, but results are limited by high heterogeneity and trial quality.

This meta-analysis evaluated the impact of low glycemic index (LGI) and low glycemic load (LGL) diets on metabolic parameters in a population of 1,265 humans. The analysis synthesized data regarding body weight, lipid profiles, and various inflammatory markers to determine the efficacy of these dietary interventions.

Key findings indicated significant reductions across multiple metrics: body weight (SMD = -1.09), BMI (SMD = -1.39), total cholesterol (SMD = -0.91), triglycerides (SMD = -0.66), and LDL-C (SMD = -1.40). Additionally, HDL-C showed an increase (SMD = 0.67). Inflammatory markers were attenuated, including C-reactive protein (SMD = -0.86), leptin (SMD = -1.11), TNF-alpha (SMD = -0.41), and IL-6 (SMD = -0.55). Adiponectin showed no significant change.

The authors note several limitations, including profound statistical heterogeneity across most metabolic outcomes (I2 values ranging from 82% to 95%) and suboptimal methodological quality of the included trials. Specifically, results for TNF-alpha and IL-6 were noted as statistically unstable. Due to these factors, the certainty of the evidence is low. While LGI/LGL diets may favorably modulate weight and lipid metabolism, clinical application should be approached with caution given the high heterogeneity and study limitations.

Researchers analyzed data from 1,265 people to see how diets with a low glycemic index (LGI) and low glycemic load (LGL) affect the body. The study looked at several factors, including body weight, blood fats like cholesterol and triglycerides, and markers that indicate inflammation in the body.

The findings showed that these specific diets were linked to lower body weight and lower BMI. They also showed a link to improved lipid profiles, specifically by lowering total cholesterol and LDL (bad) cholesterol while increasing HDL (good) cholesterol. Additionally, several inflammatory markers like C-reactive protein and leptin showed signs of decrease.

However, these results should be viewed with caution. The study noted that the quality of the original trials was not always high, and there was a lot of variation between different studies. Because of this inconsistency, the findings are not definitive. People should talk to their doctor before making major dietary changes to manage weight or cholesterol.

What this means for you:

Low glycemic index diets may improve weight and cholesterol, but results vary due to inconsistent study quality.

Common questions

What are the main benefits of a low glycemic index diet?

The study found that these diets were linked to a reduction in body weight and BMI. They also showed a link to lower total cholesterol, lower triglycerides, and lower LDL cholesterol, while increasing HDL cholesterol.

Does this diet help with inflammation?

The data showed that these diets were linked to a decrease in several inflammatory markers, including C-reactive protein and leptin. However, the results for some specific markers like IL-6 and TNF-alpha were less stable.

How reliable are these findings?

The evidence is of low certainty because the original trials had varying quality and showed a lot of inconsistency between studies. Because of this, the results should be interpreted with caution rather than as a guaranteed outcome.

Study Details

Study typeMeta analysis

EvidenceLevel 1

PublishedJun 2026

View Original Abstract ↓

ObjectiveTo evaluate the potential associations between low glycemic index (LGI) and low glycemic load (LGL) diets and variations in body weight, lipid profiles, and inflammatory markers through a meta-analysis.MethodsSystematic searches were conducted in PubMed, Cochrane Library, EMBASE, Web of Science, and Google Scholar for randomized controlled trials (RCTs) published through November 2025 (PROSPERO: CRD420251247827). Standardized mean differences (SMDs) with 95% confidence intervals (CIs) were estimated using random-effects or fixed-effects models.Results21 RCTs (n = 1,265) were included. Meta-analytic evidence suggested that LGI/LGL diets were potentially associated with reductions in body weight (SMD = −1.09, I2 = 92%), body mass index (BMI) (SMD = −1.39, I2 = 93%), total cholesterol (TC) (SMD = −0.91, I2 = 94%), triglycerides (TG) (SMD = −0.66, I2 = 92%), and low-density lipoprotein cholesterol (LDL-C) (SMD = −1.40, I2 = 95%), alongside an elevation in high-density lipoprotein cholesterol (HDL-C) (SMD = 0.67, I2 = 88%). Significant attenuations were also identified in C-reactive protein (SMD = −0.86, I2 = 91%), tumor necrosis factor-alpha (TNF-α) (SMD = −0.41, I2 = 0%), interleukin-6 (IL-6) (SMD = −0.55, I2 = 82%), and leptin (LEP) (SMD = −1.11, I2 = 90%). However, no significant change was found for adiponectin (APN). Crucially, profound statistical heterogeneity was observed across the majority of metabolic outcomes.ConclusionCurrent evidence suggests that LGI/LGL diets may favorably modulate body weight, lipid metabolism, and specific inflammatory markers. Nevertheless, these pooled estimates must be interpreted with extreme caution due to profound inter-study heterogeneity, suboptimal methodological quality of the included trials, and the statistical instability of TNF-α and IL-6. Consequently, this meta-analysis underscores the limitations of the existing literature rather than establishing definitive clinical efficacy.

LGI and LGL diets reduce body weight, lipid profiles, and inflammatory markers in humansLow Glycemic Index Diets May Improve Weight and Cholesterol Levels

Common questions

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LGI and LGL diets reduce body weight, lipid profiles, and inflammatory markers in humansLow Glycemic Index Diets May Improve Weight and Cholesterol Levels

Common questions

Study Details

Sitagliptin and liraglutide superior for CGM targets in type 2 diabetes

Two diabetes drugs outperform others in long-term glucose control

Clinical research that matters. Delivered to your inbox.

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