Probably fine, provided you trained your tongue and brain to not be so sweet driven.
For example, I don't (read: close to can't) drink full strengh juice or sports drinks. I cut them with approx 75% water. I can't imagine how people don't do this.
BTW, I a couple weeks ago I noticed the "one third the sugar" grape juice looks to be nothing other than regular grape juice with water added. Imagine that, same price, one-third the actual product. Great work if you can get it.
