When is too early for soda?

So this is more on the health and walfare side of things but might still be interesting. This morning I walked into work like any other day and as I made my way to my cube, I heard the sound of my cube neighbor cracking open a can of Mt Dew. Now, up to about 2 years ago, I used to drink a lot of Mt Dew, like 4 to 5 12oz bottles during an 8 hour shift; was good but I stopped that and now I haven't had any soda since.

So as we were waiting for our PCs to boot up, he and I were talking and I asked him as early does he start to drink his can of pop. We both agree that caffeine is caffeine but is 7:00am too early for your fuzzy sugar water fix?