Fence sitter, what are you calling too low? I don't think I've been above 5% body fat at any time in the last 3 years, and I don't know of any adverse health effects.
I don't monitor my fat intake at all, but I definitely don't drink cokes.
Activity level up, cokes down.
Also, I think eating more often and smaller portions makes the body tend to store less fat than larger meals 2-3 times a day.
More than anything, I'd say be active. Walk to the store, ride bike across town, etc.