Study suggests fluctuating blood sugar levels may boost next-day wellbeing in people with diabetes

German researchers find that both stable glucose levels and greater daily fluctuations may influence the next day’s wellbeing in those with diabetes, challenging conventional control strategies.

A German research team has found that blood sugar patterns may affect how people with diabetes feel the next day in ways that are not entirely intuitive. The analysis, due to be presented at the annual meeting of the European Association for the Study of Diabetes in Milan, tracked 400 adults with type 1 and type 2 diabetes and found that a greater share of time in the normal glucose range on one day was linked with better quality of life the following day.

The same research also found a second, more surprising statistical relationship: when day-to-day glucose swings were higher than a person’s own usual level, participants were also more likely to report better quality of life the next day. That finding does not mean unstable blood sugar is beneficial, but it does suggest that the burden of constantly striving for tighter control may sometimes weigh on daily life. The study was carried out by researchers at the Diabetes Research Institute in Bad Mergentheim, Germany, and was reported ahead of presentation by SciTechDaily.

Participants wore continuous glucose monitoring, or CGM, sensors for 14 days and recorded their quality of life, stress, mood and energy each day. The researchers then compared the previous day’s glucose data with the following day’s self-reported well-being. Time spent in the 70 to 140 mg/dL range was associated with better next-day quality of life, while time spent below 70 mg/dL or above 180 mg/dL did not show a clear link with the following day’s well-being.

The findings should be read cautiously. The report describes an observational analysis, which can identify associations but cannot prove cause and effect. The researchers also have not yet published the work in a peer-reviewed journal, so the results remain preliminary. That means the study should not be taken as a signal for patients to relax established treatment goals; instead, it adds to earlier evidence that glucose variability can be tied to quality of life, while also highlighting the possibility that the effort required to keep blood sugar highly steady may itself carry a cost.