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Blood sugar levels tend to rise and fall during certain predictable times of the year, and even certain days of the week, according to a recent report from Livongo.

The company found blood sugars begin to increase on the Fourth of July, reaching their yearly peak around Christmas. They then decline throughout the winter and spring.

What’s the reason for this? There’s no way to say for sure, but we speculate that food-centric holidays – think Independence Day cookouts and Thanksgiving dinner – play a role in the rise from July to December, while New Years’ Resolutions may help explain the subsequent fall.

The research analyzed more than two million glucose checks to find these patterns. The data also indicates users have the highest blood sugar numbers on Saturdays and Sundays and the lowest on Thursdays. This may tie in with the structure of people’s working weeks, with less strict glucose management and portion control on the weekends.

Still, there likely isn’t a single explanation for these patterns. Everyone is different, and any of the 42 factors affecting blood glucose could be at work! But the data can help us be more aware of our own blood sugar trends, even if your own experience doesn’t necessarily match these specific trends. Do you tend to be higher during certain days of the week, or certain times of the year? Patterns can help us understand what actions to take to spend more time in range.