Type 2 diabetes usually develops in people over the age of 40 years, and the risk of getting it increases with age. It is more common in men and hyperglycaemia caused by untreated type 2 diabetes can lead to a number of long-term complications. It confers a two to four-fold greater risk of coronary heart disease among men compared to a three to five-fold increased risk among women. This article looks at the latest guidance from NICE on management.