New research suggests that keeping blood sugar extremely steady may come with an unexpected tradeoff for some people managing diabetes, challenging long-held assumptions about the psychological toll of rigid glycemic management.
The findings, scheduled to be presented at the upcoming Annual Meeting of The European Association for the Study of Diabetes (EASD) in Milan, Italy—running from September 28 to October 2—indicate that individuals with type 1 or type 2 diabetes sometimes reported a better quality of life after days when their glucose levels fluctuated more, provided those levels remained within safe boundaries.
By pairing comprehensive data from continuous glucose monitoring (CGM) devices with daily well-being assessments, researchers uncovered a nuanced picture of living with a chronic condition. Their results suggest that the relentless effort, mental energy, and lifestyle restrictions required to minimize every single glucose fluctuation could inadvertently make it harder for some people to fully enjoy everyday activities and maintain a sense of normalcy.
The research was spearheaded by Professor Dominic Ehrmann of FIDAM, the Research Institute Diabetes Academy Mergentheim, located in Bad Mergentheim, Germany, alongside a dedicated team of colleagues committed to understanding the holistic impact of diabetes on human well-being.
Looking Beyond Blood Sugar Numbers
Helping people with diabetes maintain a high quality of life is universally recognized as a fundamental pillar of modern clinical treatment. While strict blood sugar control remains critical for preventing long-term medical complications, researchers increasingly want to understand how day-to-day diabetes management affects psychological and emotional health, including mood, energy levels, sleep quality, daily stress, and the ability to participate freely in normal social and professional activities.
The new analysis was specifically designed to examine whether specific glucose patterns recorded around the clock by modern CGM devices were associated with the daily quality of life experienced by people living with both type 1 and type 2 diabetes.
The underlying data for this investigation came from the PRO-MENTAL study, a comprehensive research initiative funded by the German Center for Diabetes Research (DZD). As part of this study, participants rigorously rated their daily quality of life for 14 consecutive days using a scientific methodology known as ecological momentary assessment (EMA), which relies on the standardized WHO-5 well-being questionnaire.
The WHO-5 questionnaire asks participants to thoughtfully rate five core statements reflecting their subjective psychological well-being over a given timeframe. To capture a holistic view of each participant’s daily experience, the researchers also collected daily information regarding sleep quality, perceived psychological stress, overall mood, and subjective energy levels using the exact same EMA approach throughout the two-week observation period.
Tracking Glucose Around the Clock
Continuous glucose monitoring data gathered from the same 14-day period allowed Professor Ehrmann’s research team to examine several distinct, clinically relevant measures of glucose control in meticulous detail. These metrics included the amount of time a participant’s blood sugar spent below the safe therapeutic range, known as time below range, or TBR, defined as readings under 70 milligrams per deciliter. They also evaluated time above the safe range, known as time above range, or TAR, categorized as readings over 180 milligrams per deciliter, and the time spent safely within the normal target range, known as normoglycemia or TING, spanning from 70 to 140 milligrams per deciliter.
In addition to these time-based metrics, the team analyzed glucose variability. This specific measure reflects the degree to which a person’s blood sugar dynamically rises and falls over the course of the day and night.
Equipped with this vast pool of objective sensor data and subjective psychological assessments, the researchers applied advanced statistical modeling to determine whether specific glucose patterns, sleep quality, stress levels, mood, and daily energy experienced on one day could successfully predict the quality of life reported by participants on the following day.
To ensure the integrity of the findings, the researchers also ran a separate, parallel analysis to see whether same-day measurements were associated with that exact same day’s quality of life. Furthermore, all statistical models carefully accounted for critical demographic and clinical variables, including the participant’s age, biological sex, and specific diabetes type. The models also controlled for the previous day’s quality of life to ensure that preexisting baseline moods were not unduly driving the statistical results.
400 People With Diabetes Took Part
The robust analysis ultimately included complete, high-quality data from 400 individuals living with diabetes. Within this diverse cohort, 72 percent of the participants managed type 1 diabetes, while 28 percent managed type 2 diabetes. The group was balanced across genders, with 55 percent identifying as female. The average age of the participants was 47 years old, with an age range spanning from 32 to 63 years, and the mean glycated hemoglobin, or HbA1c—a standard clinical measure reflecting long-term blood sugar control—stood at 7.6 percent.
When the statistical models were fully executed, two distinct and compelling glucose patterns immediately stood out from the data.
Spending more time within the normal, healthy glucose range on any given day was significantly and positively associated with a better quality of life on the very next day. However, in a finding that surprised the research team, greater glucose variability on the previous day was also robustly linked to a higher quality of life the following day.
By contrast, the amount of time participants spent outside the safe glucose range—either above or below acceptable thresholds—on the previous day did not show a statistically significant association with their quality of life the subsequent day.
Beyond glucose metrics, the lifestyle data yielded expected positive correlations. Better sleep quality during the preceding night was clearly linked to improved well-being the next day. The same positive relationship held true for higher energy levels reported on the previous day, which were measured by asking participants to rate how energetic they felt on a numerical scale ranging from zero, meaning not at all, to ten, meaning very much.
Interestingly, when looking at same-day measurements, the data revealed that daily glucose readings were not directly associated with the quality of life reported on that exact same day, highlighting a delayed psychological or behavioral reaction to blood sugar management efforts.
A Possible Cost of Trying to Keep Glucose Too Steady
The researchers emphasize that these complex results should not be interpreted to mean that poor glucose control is somehow beneficial or desirable for health. On the contrary, spending more time safely within the normal blood sugar range was clearly associated with a better quality of life, reaffirming that optimal clinical control remains vital for physical well-being.
Instead, the authors explain that the counterintuitive finding regarding higher glucose variability points toward a different, highly psychological phenomenon. Individuals who work exceptionally hard to eliminate all normal, everyday fluctuations in their blood sugar may sometimes feel compelled to impose strict, burdensome restrictions on their daily routines. These self-imposed limitations can ultimately make everyday life significantly less enjoyable or cause certain normal social, professional, or physical activities to feel far too difficult or stressful to pursue safely.
Summarizing the implications of their work, the study authors stated that days with higher time spent in the normal, safe range for blood sugar were followed by days on which individuals with both type 1 and type 2 diabetes reported a better quality of life, underscoring the ongoing importance of optimal blood sugar control for overall health and well-being.
However, they noted that the association between higher-than-usual glucose variability and improved next-day quality of life offers a crucial window into the lived experience of chronic illness. These findings suggest that individuals may experience a reduced quality of life when they attempt to monitor and minimize their natural glucose fluctuations too strictly. This reduction in well-being is potentially driven by the heavy psychological burden and lifestyle restrictions associated with such rigid management, which may ultimately contribute to some people living with diabetes feeling unable to safely or freely engage in certain everyday activities.