You know that there are numerous influences on your HbA1c levels - but here's one you may not have thought about: in winter, most people get less physical activity than they do during the rest of the year, which can mean higher blood glucose levels unless you adjust your nutritional plan accordingly.

Balance between dietary intake and energy consumption through daily physical activity is the most influential factor in glycemic control. Nutritional plans usually take a person's general level of activity into account - but are seldom adjusted for seasonal variation.

A report from Japan documented a half-percent increase in HbA1c levels during the winter, when it gets dark early and is icy cold outside. The researchers noted that the increase is likely caused by an increase in calorie intake and a decrease in physical activity during winter months.

Bear this in mind if your opportunities for exercise are reduced during the winter months.

Related information: Lifestyle - Exercise | More about HbA1c