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Raspberry Consumption Linked to Changes in Insulin and TNF-α Levels

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Raspberry consumption has recently been spotlighted for its potential health benefits, yet its precise effects on inflammatory markers and glycemic control remain a topic of debate. A new meta-analysis delved into this issue by rigorously examining existing randomized controlled trials. The study analyzed data from PubMed, Web of Science, and Scopus databases, focusing on outcomes such as insulin concentration and tumor necrosis factor-α (TNF-α) levels. The findings reveal intriguing insights that could shape future nutritional guidelines and research directions.

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Significant Findings in Insulin and TNF-α Levels

The meta-analysis demonstrated that raspberry consumption significantly increased insulin concentrations with a weighted mean difference (WMD) of 1.89 μU/mL (95% CI: 1.45, 2.34; P

Inconclusive Effects on Other Glycemic Markers

Despite these significant changes in insulin and TNF-α levels, the study found no substantial impact on other glycemic markers. Specifically, raspberry consumption did not significantly alter fasting blood glucose, hemoglobin A1C, glucose tolerance tests, or the homeostatic model assessment for insulin resistance. Concentrations of C-reactive protein and interleukin-6 also remained unaffected.

Practical Implications for Consumers and Researchers

  • Incorporating raspberries into the diet may enhance insulin levels and reduce inflammation, as indicated by decreased TNF-α.
  • Given the neutral effects on other glycemic markers, raspberries alone may not suffice for comprehensive glycemic control.
  • Future research should focus on larger sample sizes to validate these findings and explore the mechanisms behind the observed effects.

The study underscores the complexity of dietary impacts on health, suggesting that while raspberries can positively affect certain biomarkers, their overall influence on glycemic control requires further investigation. The research protocol has been registered in the PROSPERO system (CRD42023477559), paving the way for more extensive studies to confirm these preliminary findings.

Original Article: Curr Dev Nutr. 2024 May 3;8(6):102161. doi: 10.1016/j.cdnut.2024.102161. eCollection 2024 Jun.


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