Claim: 3.3m people diagnosed with diabetes in the UK in 2013/14, whilst an additional 590,000 are undiagnosed.
Fact-check: Diagnosis unknown: how many diabetes cases go undetected? - Full Fact
Verdict: gp practice registers support the 3.3m figure, but the methodology and reliability of the undiagnosed figure is more uncertain.
Organisation: Full Fact
Author: Amelia Ash
Date published: 2015-08-17T00:00:00