I'm with you on the sugar, but caffeine? From the (very thorough) Wikipedia page, it appears that there are as many good side effects of caffeine (such as lower risk of certain cancers, Alzheimers and diabetes) as there are bad ones.
No jitters but if I take all 4 at once I get a pretty unpleasant "coming up" feeling for about 15 minutes. I usually just have 2 a day, and I'd recommend people start with 1 just in the morning.
From persona experience i either have to go a few days without or drink my third cup (drip brewed) of the day to get anything noticeable.
On the other hand, spiders DO build web 'sites' and await food delivery...
there are many good side of sugar as well, as there are bad ones. let's stop being religious with food. it's a question of education, and measure. The same could be said with fats, caffeine and so on.