Kyoto University: Olive oil before glucose reduces sugar
- Consuming fat before carbohydrates can reduce the sharp post-meal spike in blood sugar, according to research in mice.
- Researchers at Kyoto University examined how the timing of fat consumption affects glucose processing by assigning fasted mice to three distinct groups.
- When olive oil was consumed before glucose, the initial rise in blood sugar was smaller than when the oil followed the sugar.
Consuming fat before carbohydrates can reduce the sharp post-meal spike in blood sugar, according to research in mice. The findings demonstrate how dietary fat engages a coordinated response involving digestive hormones, pancreatic signals, and the nervous system to slow the delivery of glucose into the small intestine.
Olive Oil Experiments Reveal Delayed Glucose Spikes
Researchers at Kyoto University examined how the timing of fat consumption affects glucose processing by assigning fasted mice to three distinct groups. One group received water followed by glucose, a second group was given olive oil 15 minutes before glucose, and a third received glucose 15 minutes before the oil. The team tracked blood glucose levels, insulin, glucagon, GIP, and GLP-1, while estimating the speed of gastric emptying using acetaminophen.
When olive oil was consumed before glucose, the initial rise in blood sugar was smaller than when the oil followed the sugar. The earlier intake of fat delayed gastric emptying, slowing the rate at which food moved from the stomach into the intestine. At the same time, this sequence stimulated an early increase in glucagon, GIP, and GLP-1 hormones. Daisuke Yabe of Kyoto University noted that meal-sequencing offers a practical approach because it changes how a meal is consumed rather than requiring people to avoid entire food groups.
According to Daisuke Yabe of Kyoto University, his team has long focused on workable dietary strategies that individuals can maintain daily, pointing out that meal-sequencing is attractive because it simply alters eating habits instead of demanding the elimination of whole food categories.
Hormones and Nerve Pathways Control Blood Sugar
The experiments revealed that the blood sugar-lowering effect persisted even in mice with type 2 diabetes and severe insulin deficiency. While glucagon typically raises blood sugar by prompting the liver to release stored glucose, blocking glucagon or GLP-1 signaling individually did not eliminate the benefit of the olive oil. Only when both signaling pathways were blocked simultaneously did the beneficial effect diminish, indicating that the two hormones work together to moderate glucose levels.
Surgically interrupting the vagus nerves below the diaphragm also suggested that communication through the vagus nerve contributes to the body’s response to nutrient order. Our findings suggest that the order in which nutrients reach the gut can engage a coordinated hormone-nerve response that changes how quickly the stomach delivers glucose to the intestine,
Yabe stated.
Clinical Studies Needed for Human Diabetes Management
While the study provides a biological mechanism for why eating fat before carbohydrates may help reduce blood sugar spikes, the experiments were performed in mice. The investigation’s authors point out that further human trials will be required to ascertain whether these experimental pathways can successfully enhance glucose control in individuals both with and without diabetes.