Myth-buster

Olive oil failed to lower blood glucose in a meta-analysis of 4,334 adults — but a 25-50 g daily dose improved insulin resistance.

This is the largest systematic analysis to date on olive oil and glycemic control, and its null result for blood glucose, insulin, and HbA1c contradicts the popular belief that olive oil directly lowers blood sugar — though a signal for reduced insulin resistance suggests the picture may depend on dose and is far from settled.

Analyzing 51 randomized controlled trials involving over 4,300 people, researchers found that olive oil consumption did not significantly change blood glucose, insulin levels, or hemoglobin A1c. However, when participants consumed roughly 25-50 grams (about 2-4 tablespoons) daily, there was an improvement in HOMA-IR, a marker of how well cells respond to insulin. In short: olive oil won't reliably drop your blood sugar after a meal, but a higher daily intake might make your body more sensitive to insulin overall.

Where this fits in the evidence

This is among the first studies we've indexed on Olive Oil for Reduced Blood Glucose Levels — treat it as an early signal until more research accumulates.

The study

The Effect of Different Types of Olive Oil on Glucose Control and Insulin Sensitivity: A GRADE-Assessed Systematic Review and Dose-Response Meta-Analysis of 51 Randomized Controlled Trials.

Meta-Analysis
n = 4,334
2025-09-15
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