How does blood sugar change when drinking coffee every day?

Coffee can cause your blood sugar to rise or fall. This effect depends on your metabolism, whether you drink it with food, and how much caffeine you consume.

Drinking coffee can lead to spikes in blood sugar and changes in insulin response - Photo: FREEPIK

According to Verywell Health , drinking coffee can lead to blood sugar spikes and changes in insulin response, especially in people with insulin resistance, prediabetes, or type 2 diabetes.

Caffeine is likely responsible for this effect, stimulating the release of stress hormones like adrenaline, which can interfere with insulin production.

Caffeine also signals the liver to release stored glucose, making it difficult for cells to absorb excess glucose from the blood.

Be mindful of whether you drink your coffee on an empty stomach or a full stomach. "Caffeine absorption is faster on an empty stomach," says Candace Pumper, PhD, a registered dietitian at The Ohio State University Wexner Medical Center.

She added that the rapid absorption could lead to more pronounced spikes in blood sugar, especially if the coffee was spiked with sugar or sweetened with cream. However, these effects are usually short-lived.

"Long-term studies generally show a strong inverse association between higher coffee consumption and lower risk of type 2 diabetes," said Andrew Odegaard, PhD, associate professor of diet, nutrition, and type 2 diabetes at the Joe C. Wen School of Population and Public Health at the University of California, Irvine.

In other words, drinking more coffee tends to be associated with a lower risk of type 2 diabetes. This may be because coffee contains other compounds with antioxidant and anti-inflammatory properties, which can help balance out the negative effects of caffeine over time.

Overall, a daily coffee habit isn't necessarily bad for your blood sugar, but how and when you drink it is important.

While caffeine can cause sudden spikes in blood sugar, especially when consumed on an empty stomach or in people with insulin resistance, the long-term effects of coffee may support better glucose control.

How to avoid high blood sugar when drinking coffee

If you're concerned about your blood sugar levels rising but don't want to give up coffee, there are more scientific ways to drink it that are backed by research:

- Drink coffee with or after meals: Combine coffee with a meal or snack to slow the rate of caffeine absorption and minimize sudden blood sugar spikes.

- Choose sugar-free or naturally sweetened varieties: Use natural sugar substitutes instead of sugar or flavored syrups.

- Use low caffeine or decaffeinated: Reduce caffeine intake if you are particularly sensitive or already insulin resistant.

- Try these coffee alternatives: Black tea, green tea, dandelion root coffee, or low-acid coffee may be gentler on blood sugar.

- Monitor body response: Pay attention to how you feel when you drink coffee. If you wear a continuous glucose monitor, you can also track how different types of coffee and times of drinking affect your body.

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