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A Curly Wurly is only (only!) 115 calories, so far less calorie-dense than some sweet things. If you freeze it before you eat it, you'll find it takes you ages to eat and hopefully satisfies all your sweet cravings. You could possibly even cut it in half and get a sugar-rush for only 60 calories
I appreciated your tip dinahsmum, I'd add another a small smear of chocolate spread satisfies my chocolate habit. I can't quote the calories but you can freeze it to make it a tiny square of chocolate if you prefer.