A friend and neighbor of mine had a dietician/nutritionist recommend that low fat/carb-fest diet to her last year-her kitchen was stocked with enough pasta, potatoes and rice to see her through 6 months of a famine, and she was gaining even more weight till another neighbor and I turned her on to the Paleo and Keto way of eating-once she got with the program, she started losing weight, was not tired at work and now she is not on any meds any more-and her numbers are low and normal. I guess some nutritionists and dieticians have been living off-grid in the Alaskan bush totally isolated from the internet and other humans for the last 4-5 years...
Actually this was nearly 20 years ago now. It was the standard diet for diabetes. As little fat as possible (so you’re always hungry) and stuff yourself with carbs. Don’t worry about your blood sugar, we will ‘control’ those (for some value of you’re on a never ending uphill treadmill of increasing dosage and number of pharmaceuticals) with meds...
The food pyramid has had a lasting effect in the medical community. When my husband was diagnosed, his doctor referred him to a dietician, who put him on a low calorie, low fat, high carb diet. It was a disaster.