Yes, I did the nhs recommended diet for 7 years when told I was prediabetic. Blood glucose continued to rise, I started putting on weight (had been stable for years prior to that) and my cholesterol went through the roof. Finally diagnosed as T2, found this site and started on a reduced carb diet initially (sub80g per day) and it worked wonders on both BG and cholesterol.
BUT, everybody is different, some of us are just not able to tolerate carbs as well as others. The thing to do is get a test meter and test before and 2 hours after eating to see what foods affect your BG and how much.