Can a face scan detect diabetes?

Short answer: no camera can measure your blood sugar today. But a face scan can measure heart signals that are linked to diabetes risk, and that is useful when paired with a validated questionnaire.

Why a camera cannot read glucose

Camera pulse measurement (rPPG) reads tiny colour changes as blood flows through facial skin. Glucose does not change skin colour in a way a phone can detect. Research prototypes using special light sensors have not reached reliable accuracy, and regulators including the US FDA have warned people not to use devices that claim non-invasive glucose readings.

What a face scan can honestly add

• Resting heart rate. Meta-analyses find higher resting pulse is linked to a higher risk of developing type 2 diabetes.
• Heart rate variability (HRV). Low HRV appears early in insulin resistance and prediabetes, reflecting changes in the nervous system.

Neither is a diagnosis. They are clues that become meaningful when repeated and combined with known risk factors.

The validated part: a risk score

For Indian adults, the Indian Diabetes Risk Score uses age, waist size, activity and family history. It was built from a large Chennai population study and flags people who should get a blood test.

What to do next

If your risk is moderate or high, ask your doctor for an HbA1c or fasting glucose test. It is inexpensive and definitive.

Sources

• US FDA, safety communication on non-invasive glucose devices (2024)
• Aune D et al., Resting heart rate and diabetes risk, meta-analysis (2015)
• Mohan V et al., Indian Diabetes Risk Score, JAPI (2005)