I had a similar thing about pepsi max with one doctor. He said it was bad for diabetics and I shouldn't drink it.Yes , I have had similar comments at my doctors , not all nurses though , some understand more than others , as in my comment when first told I was diabetic , you can’t have prawn cocktail or should I say , can’t have prawns , when asked why , because people have them with Marie Rose sauce and as has already been said , nothing wrong with the sauce , that was from the diabetic nurse, I no longer see her for various reasons .
I asked why as there is literally 0% carbs in it, he finally told me that it's because studies have shown (couldn't tell me which studies) that people who drink diet drinks get hungry and eat a lot more food, especially sugary food.
I have dropped from 20 stone to 13.5 stone and still drink pepsi max (only about 2 cans a day with a meal) and I haven't felt the need to stuff my face with sugary foods at all.