Thanks to a couple of birthdays pulses I'm now back on the sugar! But yes, I did 10 days without any added refined sugar. So fruit is fine, ice-cream, cake, sweetened yogurts etc not fine. I avoid any ready-made stuff with 'hidden' sugar in too like baked beans, supermarket tomato pasta sauces.
In theory you could pig out on fruit to get the sugar hit but in my experience I don't eat any more - 1 to 2 portions a day. I did avoid dried fruits though.
I find that once I'm not mindlessy picking I have a better diet anyway - so it helps with the no snacking business!
Raw nuts are brilliant. In theory they are hugely calorific but they are one of my main food groups these days and I have lost loads of fat and increased my muscle in the last few months, so I think they have a different effect on your body than say, biscuit calories. Very nutritious too.