I know I told you this before but read salt sugar fat which explains how and why this happens. There's been plenty of to programs that explained the bliss point of foods and how they substitute fat for sugar.
People always miss this when they say for example that Aldi brand is as good as the market leader. Most of the time when I have then compared the label they contain more salt or sugar.
I recently watched "that sugar film", I always try to keep up on relatively healthy eating research (putting into practice isn't so easy I admit). Although now I think i see why more than before.
I was stunned how a guy who basically ate hardly any processed sugar could change so dramatically in such a short period of eating sugar.
Although the key is that different sugar acts differently in the body.
Putting this into context, he was eating things like low fat yogurt, and also balancing his calories to a similar amount to the diet switch. He wasn't eating junk food, mainly food marketed at as as healthy.
He drank a smoothie when he landed in the US that contained something like 140 grams of sugar.