The cost of chasing a flat line: diabetes, control and daily wellbeing
What happened
A study presented ahead of the European Association for the Study of Diabetes annual meeting has looked at something that rarely gets measured: how people actually feel, day to day, while managing their diabetes. The research was reported on 11 September 2026. It is called the PRO-MENTAL study and was led by Professor Dominic Ehrmann at FIDAM, the Research Institute Diabetes Academy Mergentheim in Bad Mergentheim, Germany. The full findings are due to be presented at the EASD meeting in Milan between 28 September and 2 October 2026. The design is unusual and rather clever. Four hundred people with diabetes, 72% of them with type 1 and 28% with type 2, were followed for 14 days in a row. Their blood sugar was tracked continuously using CGM sensors. At the same time, they were asked repeatedly during everyday life how they were feeling, using short questions based on the WHO-5 wellbeing questionnaire. Researchers call this method ecological momentary assessment: instead of asking people to remember later, you ask them in the moment. Two findings stood out. Spending more time in the normal blood sugar range predicted better quality of life the next day. So did higher glucose variability, meaning days where readings moved around more. But days of stricter glucose control did not bring any same-day improvement in quality of life. Better sleep quality and higher energy levels were also linked to better wellbeing the following day. Professor Ehrmann's team summarised the concern plainly: "Individuals experience lower quality of life when attempting to minimise glucose fluctuations too strictly, potentially due to the associated burden or restrictions in daily life."
Why this matters
Diabetes care runs on numbers. Time in range. HbA1c. Variability. Modern sensors produce a constant stream of them, and there is a quiet assumption underneath the whole system: the flatter the line, the better. This study suggests the picture is more complicated. Spending time in range does seem to help how people feel. That fits with what most people with diabetes will tell you, because being very high or very low feels awful. But relentlessly minimising every fluctuation appears to carry its own cost. Keeping a line perfectly flat means constant attention: checking, correcting, planning every meal, refusing spontaneity, waking in the night. That effort does not appear from nowhere. It comes out of someone's day. There is a recognised name for where this can lead. Diabetes distress describes the emotional weight of managing a condition that never takes a day off. It is common, it is different from depression, and it is strongly linked to burnout and to people disengaging from their own care. That last point is why this matters practically. Someone who burns out and stops engaging will end up with worse control than someone who aimed for good rather than perfect. Sustainability is part of effectiveness.
What the evidence actually says
There are strengths here worth naming, and limits worth being honest about. The design is the strong part. Asking people how they feel in the moment, repeatedly, over 14 days, avoids the distortion that creeps in when people are asked to recall a month later. Pairing that with continuous sensor data means both sides of the comparison are measured properly rather than estimated. Four hundred people is a reasonable size for this kind of intensive study. Now the caveats. These findings have been released ahead of a conference presentation. Conference research is an early stage of publication. It has been reviewed by the conference, but not necessarily through the full peer-review process a journal applies. Details can change between an abstract and a final paper. The study is also observational. It shows that certain patterns come before better or worse wellbeing. It does not prove the direction of cause. It is quite possible that feeling well makes it easier to manage glucose, rather than the other way round, and the truth is probably a loop rather than a line. The glucose variability finding is genuinely counterintuitive and should be treated with care. More variability being linked to better next-day wellbeing is not a licence to abandon control, and nobody involved is suggesting that. It may reflect the effort of suppressing variability rather than any benefit of the variability itself. And the participants were mostly people with type 1, in Germany, using CGM. That is not everyone with diabetes.
Practical advice
The useful message here is about balance, not about lowering your standards. Do not change your targets on the strength of a conference abstract. Your targets were set with your clinical situation in mind. If you think they are unrealistic for your life, that is a conversation to have, not a decision to make alone. Do say out loud if managing your diabetes is wearing you down. Diabetes distress and burnout are recognised, common and treatable, and diabetes teams are far more used to hearing about them than people expect. Saying "I'm finding this exhausting" is clinically useful information, not a complaint. Think about time in range rather than chasing a flat line. Time in range is the measure the study linked to better next-day wellbeing, and it is also more achievable than perfection. Don't overlook sleep and energy. This study found both predicted better wellbeing the following day. They are not side issues in diabetes management, they are part of it. Watch out for alarm fatigue if you use CGM. Constant alerts can become a source of stress in themselves. Alarm settings can often be adjusted, and your team can help you tune them. And if low mood or anxiety has lasted more than a couple of weeks, speak to your GP. In England you can also self-refer to NHS Talking Therapies without going through your GP, and several services have specific pathways for people with long-term conditions. Diabetes UK also runs a helpline for exactly these conversations.
What to know
The PRO-MENTAL study tracked 400 people with diabetes for 14 days using continuous glucose monitors alongside repeated in-the-moment wellbeing questions. More time in the normal blood sugar range predicted better quality of life the next day. Days of stricter control brought no same-day improvement, and the researchers suggest that trying to minimise fluctuations too strictly may itself reduce quality of life through the burden it creates. Better sleep and higher energy also predicted better wellbeing the following day. This is conference research, presented ahead of the EASD meeting in Milan, and it is observational. It shows patterns rather than proving cause, and the direction may run both ways. The takeaway is not to aim lower. It is that the effort of management is a real cost that deserves to be part of the conversation, and that a plan you can sustain will usually beat a plan that exhausts you. Sources: News-Medical, 'Stricter glucose control may affect quality of life in people living with diabetes', 11 September 2026, https://www.news-medical.net/news/20260911/Stricter-glucose-control-may-affect-quality-of-life-in-people-living-with-diabetes.aspx; PRO-MENTAL study (Ehrmann et al., FIDAM, Research Institute Diabetes Academy Mergentheim), to be presented at the European Association for the Study of Diabetes Annual Meeting, Milan, 28 September to 2 October 2026, https://www.easd.org/; Diabetes UK, guidance on diabetes and emotional wellbeing, https://www.diabetes.org.uk/ This article is for general information and does not replace advice from a doctor, pharmacist, diabetes nurse or other qualified healthcare professional. Do not change your diabetes targets or treatment without speaking to your diabetes team.
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