The Single-Snapshot Problem
HbA1c and fasting glucose are snapshots — valuable, but incomplete. They tell you your average blood sugar over months or a single moment in time. What they cannot tell you is how your glucose fluctuates after meals, during sleep, in response to stress, or how different foods uniquely affect you. Continuous Glucose Monitoring (CGM) fills this gap with real-time, 24/7 glucose data.
How CGM Works
A small sensor — worn on the back of the upper arm — measures glucose in the interstitial fluid every few minutes. The data streams to your phone, giving you a live graph of your glucose response to every meal, workout, night of sleep, and stressful event. Patterns that were invisible become unmistakably clear.
Two people can eat identical meals and have completely different glucose responses. A CGM reveals your unique metabolic fingerprint.
What CGM Reveals Beyond Diabetes
Post-prandial glucose spikes — normal fasting glucose can mask dangerous 2-hour post-meal surges
Glycemic variability — large swings between high and low glucose are independently damaging, even if average glucose is normal
Dawn phenomenon — overnight glucose rises driven by cortisol; a sign of stress-induced insulin resistance
Food sensitivity — identifies which specific foods spike your glucose, enabling personalised nutrition
Exercise impact — shows how different types and timing of exercise affect your glucose for hours afterwards
Sleep-glucose connection — poor sleep predictably worsens glucose control the following day
Who Should Consider CGM?
Anyone with prediabetes (HbA1c 5.7–6.4%) — CGM-guided lifestyle change can reverse the trajectory
Anyone with a family history of diabetes — detect dysfunction before HbA1c rises
Women with PCOS — glucose instability drives androgen production
Individuals with stubborn weight — CGM often reveals hidden insulin resistance as the barrier