I think it varies a LOT person to person. All three of my kids were fed the same. All are grown now at 26, 29 and 30. All are very slim. I considered anything with sugar a treat, that they had when I felt like giving some. Going on outings etc always would get treats whether it be candy, ice-cream, dessert, candy floss...whatever. I also baked things like rice pudding, mini proper homemade cupcakes, apple pies, trifles, that sort of thing. usually for weekends. I kept simple bought cookies in the house, not the big creamy ones but more like English tea cookies, that they would munch on. Not overly sweet. Sometimes had English candy in the house too, but couldn't too often as I tend to binge on it myself...ooops!
They always stayed the same with their desire for it though. My youngest couldn't get enough candy/sweet things....still struggles with limiting it, has to be firm with herself. My middle one also loves candy but not to the extent of my youngest. Maintains a size 0 despite a GF SAD diet. My eldest, eats candy and dessert on occasion, but it has to be a good one and wouldn't miss it much. As kids with Hallowe'en candy it was pretty obvious. I didn't restrict it, they could eat what they wanted. My youngest would have hers eaten in a couple of days, middle one within a week or two and my eldest, you would find it in his drawer a year later as he had forgotten about it. I, and my husband were brought up the same. We both struggle with a sweet tooth, him more that me even, for me it has to be good, not the packaged nasty cakes. We both have struggled to keep our weight in check but neither have be very large. Last year I gained more than I had ever gained before fixing it. Been a constant struggle gaining and losing around 20lbs yo-yo over the years. All down to sugar.
Started Primal June 2012 at 148.5lbs, and 5' 1", reached goal weight in 5 months.
Lowest weight 93lbs - too thin. Now stable at 102lbs much better weight for me at my age.
Primal, minus eggs, dairy and a myriad of other allergens.