CGM and Keto: Using Continuous Glucose Monitors to Optimise Your Diet
Medical Disclaimer: CGM guidance for diabetics should always involve your diabetes care team. This article contains general information only.
Continuous glucose monitors (CGMs) — small devices worn on the upper arm that track blood glucose in real time — have transformed diabetes management. They are also becoming powerful tools for keto optimisation in non-diabetic users.
How CGMs Work
A small filament inserted just beneath the skin measures interstitial glucose every few minutes. Data is transmitted wirelessly to a smartphone app, providing a continuous graph of blood glucose throughout the day and night.
For Type 2 Diabetics on Keto
CGMs allow immediate feedback on how different foods, exercise, and stress affect blood glucose. This enables precise dietary fine-tuning that is impossible with finger-prick testing alone.
For Non-Diabetic Keto Users
CGMs reveal personal glucose responses to specific foods — some people spike significantly from foods labelled “keto-friendly.” This personalised data is invaluable for optimisation.
What to Look for in CGM Data
Post-meal spikes above 7.8 mmol/L, overnight baseline levels, and average daily glucose (time in range) are the key metrics to monitor.