Diabetes is one of the most costly diseases ever in both human and economic terms. To reduce today's burden and that on future generations, it is in everyone's interest that cost-effective measures to prevent diabetes are identified and implemented. The International Diabetes Federation (IDF) Task Force on Diabetes Health Economics has just completed a review of the evidence on cost-effective approaches to diabetes care and prevention. The timely publication shows that investment in diabetes care can be a cost-effective use of scarce resources. This article provides a brief summary.