A Simple Way to Blunt Blood Sugar Spikes After Meals

In the experiments, mice were divided into groups after an overnight fast. One group received olive oil 15 minutes before glucose, another received glucose followed by olive oil, and a control group was given water before glucose. Animals that received olive oil first had significantly lower blood glucose levels immediately after the meal, particularly at 15 and 30 minutes. The effect had disappeared by the one-hour mark.

The mechanism involved not a single hormone but a coordinated interaction between hormones and nerves. In mice given olive oil, gastric emptying slowed, while blood levels of glucagon, GIP, and GLP-1 increased. When both glucagon and GLP-1 were blocked simultaneously, the beneficial effect disappeared. Blocking either pathway alone did not eliminate the benefit. Disrupting vagus nerve signaling also weakened the effect of olive oil, even though hormone levels remained unchanged.

“The order in which nutrients enter the intestine can trigger a coordinated hormonal and neural response,” said the study’s lead author, endocrinologist Daisuke Yabe. The researchers also tested other fats, including flaxseed oil, lard, coconut oil, and fish oil. Overall, olive oil performed best, although flaxseed oil and lard matched it on some individual measures.

According to Yabe, the appeal of this approach lies in its simplicity: “Only the way a meal is eaten changes.” However, the findings come from experiments in mice and have not yet been tested in humans, so it is too early to apply them directly to human diets.

Nevertheless, the idea of consuming fat before carbohydrates is consistent with the broader concept of meal sequencing, which has been shown in small human studies to help blunt blood sugar spikes. The authors believe the approach warrants further investigation in full-scale clinical trials.