The 2016 Global Nutrition Report reminds us that data is important as it tells us which types of malnutrition are being reduced and how fast that is happening. If we know this we can adjust efforts and reallocate resources before it is too late. It is also important for accountability. We need to know how resources have been allocated and the effect they are having if we are to assess the performance of key stakeholders, whether from the government, civil society, the development agencies or businesses.