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Drinking coffee while eating fast food is twice as harmful to blood sugar.

Published: 2026-08-08 Author: World Gafei

Last Updated: 2026/08/08, Drinking coffee while eating fast food can double the damage to blood sugar, according to a new study from Guihu University (University of Guelph) in Canada.

The pace of modern life is very fast, and many busy office workers often have a cup of coffee and a fast food for lunch. Drinking coffee while eating fast food can double the damage to blood sugar, according to a new study from Guihu University (University of Guelph) in Canada.

The study was published in the journal Nutrition report. The study found that eating fast food high in saturated fat while drinking coffee had a worse effect on blood sugar than not drinking coffee. Usually, a healthy person's blood sugar level will rise to the highest after a high-fat meal, and if high fat plus caffeine, the blood sugar level will rise to a level similar to that of people with diabetes.

A high-fat diet inhibits GnT-4a enzymes that promote insulin secretion, leading to high blood sugar. Coupled with the effect of caffeine, this harm is doubled. Generally speaking, saturated fat affects the body's ability to remove sugar from the blood, and if caffeine is added to it, the situation is even worse. Because sugar stays in the blood for too long, it can cause damage to organs.

The study was conducted in two groups of healthy men between the ages of 20 and 30 who were given a special saturated fat drink of 1 gram per kilogram of body weight to replace the energy of a fast food meal according to their weight. Then drink 2 cups of caffeinated or decaffeinated coffee after 5 hours. The study showed that blood sugar increased by 32% in the group that drank only saturated fat drinks, while that in the group that drank both saturated fat drinks and coffee increased by 65%.

Fat plus caffeine affected the connection between the pancreas and the digestive tract, making it difficult to clean up sugar in the blood of the two groups of men in the study. In addition, allowing them to drink coffee five hours after drinking a fat drink can also increase their blood sugar, indicating that the fat intake will remain in the body for more than five hours before it is fully digested, and lunch will affect the food they eat later.

After eating high-fat fast food, please stop drinking coffee.

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