This is a link from Trudi Deakin to the presentation she delivered at the Diabetes UK Conference last week. Well worth a look at.
http://www.xperthealth.org.uk/Portals/0/Downloads/High%20fat,%20low%20carb%20diets%20and%20the%20evidence_Diabetes%20UK%202015_reduced%20memory.pdf
http://www.xperthealth.org.uk/Portals/0/Downloads/High%20fat,%20low%20carb%20diets%20and%20the%20evidence_Diabetes%20UK%202015_reduced%20memory.pdf