In type 2 diabetes, the pancreas makes insulin, but the insulin does not control metabolism well. This is known as insulin resistance. Insulin resistance is very important to recognize because it is strongly linked to higher risk of heart disease and stroke. In type 2 diabetes, insulin resistance is much more common in people who are obese. Researchers from Australia looked at how common insulin resistance is in type 1 diabetes when a person does not produce any of their own insulin, and so has to inject insulin every day. The researchers found that almost 1 in 3 adults with type 1 diabetes are insulin resistant. This is called “double diabetes.” Double diabetes (type 1 diabetes + insulin resistance) is linked to more diabetes complications, including heart disease; damage to the nerves, eyes and kidneys; and foot ulcers. Researchers concluded that double diabetes has the worst impact when it develops in young people with type 1 diabetes. Therefore, double diabetes needs to be recognized and treated early with drugs. Even better, it can be prevented when people with type 1 diabetes avoid excess weight gain.