From Deb Wills site:
If you are in Epcot, remember the Fountainview café has a sugarless cheesecake among all its pastries, which has no crust and is very good indeed. Likewise, a chocolate Mousse at Kringla og Bakeri in Norway is loaded with cream and chocolate, but sweetened with aspartame.
The sugarless chocolate mousse, listed as available at the bakery in Norway, can also be found at Pure and Simple Guilt-Free Goodies in the Wonders of Life pavilion, in Future World.
The sugarless vanilla ice cream in cups, which should be available at any vendor cart in any park, is not always stocked at every cart. However, Ice Cream Central (wherever that is) has it, and also frozen-fruit bars with no sugar (8 carbs per bar). Simply ask the CM at the cart for these items, and they will get on their walkie-talkies! The ice cream will be at the cart in about five minutes, if you don't mind waiting. I asked why they aren't always stocked. "Well, people forget about their diets when they go on vacation and we don't get many orders for them".
I recently dined at Artist Point, where they make a superlative fresh berry cobbler, including strawberries, raspberries, black and blueberries. I asked if they would give me the unsweetened berries with some heavy cream. They did _ a dish heaped high with beautiful fruit, and a small pitcher of cream. What a divine dessert _ who needs the pastru!
For sugarless candy, try the jelly beans, turtles and peanut butter cups available at Main Street Confectionary in the Magic Kingdom, and also at Sweet Treats (MGM) and the Contemporary¹s 4th floor shop.