This claim is mostly true but misleading. Dark chocolate (70%+ cocoa) contains compounds that might slightly improve insulin sensitivity and heart health, but the benefits for people with diabetes are small and not strongly proven. The claim comes from Abbott Laboratories, while it is a reputable company, it is not a peer reviewed study and may simplify the science. More neutral sources like the American Diabetes Association emphasize moderation and also note that evidence is limited. With the evidence given, dark chocolate can be a part of a balanced diet, but it should not be seen as a meaningful way to manage diabetes.