Continuous Glucose Monitors (CGMs) are revolutionizing the way diabetes is managed by offering round-the-clock insights into blood sugar fluctuations — insights often missed by standard lab tests like HbA1c, says Dr. Vijay Viswanathan, president of the Research Society for the Study of Diabetes in India (RSSDI).
Unlike traditional finger-prick glucose checks or lab reports that offer a snapshot, CGMs provide a real-time, dynamic view of glucose trends, helping patients and physicians make better-informed decisions on diet, medication, and lifestyle.
More Than Just Numbers: Real-Time Data for Smarter Care
“CGMs go beyond static blood sugar averages,” says Dr. Viswanathan. “They reveal how specific foods, sleep quality, stress, and exercise affect glucose throughout the day.” For example, he recounts a recent case where a patient’s HbA1c level was 6.1% — normally considered well-controlled — but their post-meal glucose spikes were alarmingly high.
“We later discovered the culprit: daily mango consumption. HbA1c averages out fluctuations, so spikes and dips often go unnoticed,” he said.
CGMs, on the other hand, track timing, magnitude, and frequency of glucose changes, helping pinpoint exact triggers — like a sugary fruit or a skipped workout. This allows for tailored treatment plans and tighter glucose control.
Cracking the Code on Morning Spikes
CGMs are also aiding diagnosis of conditions like the Somogyi phenomenon and Dawn phenomenon, which both cause high morning blood sugar levels but have different root causes.
“Identifying the right cause with CGM data is crucial,” explains Dr. Viswanathan. “Treatment strategies differ — adjusting nighttime insulin, tweaking meal timing, or modifying dosage.”
Helpful — But Not for Everyone
Despite the benefits, Dr. Viswanathan and other experts caution against the widespread use of CGMs among healthy individuals. “These devices are designed with diabetic users in mind. For healthy people, it can cause information overload, anxiety, and even unnecessary food restrictions,” he warns.
Moreover, healthy users might misinterpret data, leading to overcorrection or unjustified concern. “It may also become an expensive distraction from actual preventive health practices,” he adds.
While some over-the-counter CGMs exist for general wellness use, the RSSDI does not currently recommend CGMs as a general screening tool for non-diabetics.
A Boon for Children and Seniors
CGMs are particularly useful for children and the elderly, who may struggle with traditional finger-prick tests or fail to recognize symptoms of hypoglycemia.
“They reduce the pain of frequent monitoring and offer real-time alerts for dangerous glucose drops,” Dr. Viswanathan notes. “And with their user-friendly interfaces, they’re ideal for seniors — even those with cognitive limitations.”
Bottom Line: Insights with Caution
While CGMs can empower diabetics and vulnerable groups with life-changing insights, experts say context matters. Used correctly, they are a powerful tool to spot patterns that even lab tests miss — whether it’s post-meal spikes, nighttime dips, or that daily mango that pushes glucose levels out of range.
For the rest of us? A healthy diet, regular exercise, and mindful living remain the most effective — and affordable — glucose management tools.
