Levels CGM — Is Continuous Glucose Monitoring Useful If You're Not Diabetic?
Levels sells a continuous glucose monitor to healthy people for $199/month. The promise is metabolic optimization. The question is whether the data actually changes behavior — or just creates anxiety.
What Levels Sells
Levels provides a continuous glucose monitor (CGM) — a small sensor applied to the back of the arm that measures interstitial glucose every few minutes — paired with an app that scores your meals, tracks glucose trends, and provides metabolic health insights.
Originally designed for managing Type 1 and Type 2 diabetes, Levels is marketing CGMs to healthy, non-diabetic individuals as a tool for metabolic optimization. The pitch: understanding how your body responds to specific foods allows you to make better dietary choices, stabilize energy, improve sleep, and reduce disease risk.
What the Data Actually Shows
For diabetics, CGMs are transformative — they reduce HbA1c, prevent hypoglycemic episodes, and improve glycemic control. The evidence is unequivocal.
For healthy, non-diabetic individuals, the picture is murkier:
Glucose variability in healthy people is narrow. A 2019 study in PLOS Biology put CGMs on 57 healthy participants and found that glucose stayed between 70-140 mg/dL approximately 96% of the time. The "spikes" that alarm Levels users are often within normal physiological range.
Food response is real but context-dependent. Yes, different foods produce different glucose responses in different people. A 2015 Cell paper by the Weizmann Institute demonstrated significant inter-individual variability in postprandial glucose responses. But whether optimizing these responses in already-healthy individuals produces meaningful health outcomes is unproven.
Behavior change is mixed. A 2023 RCT in JAMA Internal Medicine found that CGM use in non-diabetic adults did not produce significant changes in dietary quality or cardiometabolic markers over 12 months compared to controls. Users found the data interesting but didn't substantially change behavior.
The Value Proposition
Where Levels genuinely helps:
- Pre-diabetics who don't know they're pre-diabetic (estimated 88 million Americans)
- Metabolic experimentation — quantifying how specific meals, exercise timing, and sleep affect your glucose response
- Education — most people have never seen their glucose data and learning that a bagel spikes them to 160 is genuinely useful context
- Accountability — the real-time feedback loop discourages mindless snacking
Where it falls short:
- Normal glucose variability misinterpreted as pathology — a post-meal spike to 140 is physiologically normal, not a health crisis
- Anxiety generation — some users develop orthorexic patterns around food, constantly checking glucose before and after eating
- Cost — $199/month ongoing for a sensor that provides diminishing informational value after the first 2-3 months
The Bottom Line
Levels is a well-designed product built on legitimate technology. The CGM hardware works. The app is excellent. The education content is science-backed.
The gap is between "this data is interesting" and "this data changes health outcomes in healthy people." The former is proven. The latter is not.
NORM scored Levels 51/100 — PARTIALLY ALIGNED. The technology claims are accurate. The health optimization claims for non-diabetic users outpace the evidence.
Knowing your glucose response is knowledge. Whether that knowledge changes anything — that's still an open experiment.