The Director of Diabetes UK Cymru has warned that an 'eye-watering' amount of diabetes care money "isn't being used effectively".
The Welsh NHS spends around £500 million per year on diabetes care, but the charity says that money is mostly spent on treating complications instead of preventative care.
[Our] report shows how dealing with problems early, costs could be greatly reduced and more people would live longer and healthier lives.
With such strong evidence, it is bewildering that health boards have clear plans to deliver these services and then fail to actually make them happen in practice.
Put simply, if a service is shown to improve the care provided to people with diabetes and save money, why on earth should it not be delivered universally and as quickly as possible?
Mr Williams cited improved provision of diabetes education and better foot care as two examples of good healthcare that could help prevent more long-term complications arising.
More top news
The family of 18-year-old Peter Colwell, who died from a single gun shot wound to the head, have paid tribute to him.
A driver has been jailed for four years for killing 80-year-old Tydfil Jenkins as she delivered a cake to a friend.
Capel Curig in Snowdonia clocked winds of 94 mph earlier. Whilst the worst is over, warnings remain in force.