If you read it from here you can see the studies that he cited.
http://www.drbriffa.com/2012/03/05/...y-advice-diabetes-uk-dishes-out-to-diabetics/
DUK say that they follow the NHS advice that is evidence based. I can only speak as a Type2 and would say that if all newly diagnosed had some education which included how to use a meter to understand the foods that you eat and how they affect glucose levels it would be a lot easier. It doesn't have to be high/medium/low carb but has to be something that suits you personally and helps you to manage diabetes. There are so many versions of what actually constitutes a low carb diet. Some believe you have to follow Atkins and others that you reduce the RDA of carbs. I believe that you eat to your meter.
As neither Briffa or the Dietitian on the programme are diabetics, that is the problem IMHO. They think they know what is best and that one size should fit all but it doesn't. Neither of them impressed me. He took control but was very cagey about his evidence and the Dietitian was ill prepared and hopelessly backward in coming forward.
It will not change the way I manage my diabetes.