Here's a picture from a diabetes clinic in Oxford ( source).
Eating these "foods" will keep the patients' blood sugar levels on a rollercoaster, causing blood sugar swings that can only be controlled with much insulin. This is potentially dangerous in type 1 diabetes, and in type 2 it leads to a vicious cycle of weight gain, more insulin and a chronic progressive disease.
This is really not that different from a cigarette vending machine in the waiting room of an asthma clinic. It's a sign of complete ignorance.
Instead eating a low-carb diet stabilizes patients' blood sugars and decreases the need for diabetic medications.
