Ok, now I'm with RJ and LL ----> 
Okay, clearly the problem is with my adding sugar (forget the fact that I've added fruits to my diet, which were lacking before... forget that small accomplishment

).
Let's say there are 3 smoothies.
Yours has soy milk, strawberries, blueberries and a banana.
LL's has vanilla, strawberries, blueberries, orange juice and a banana.
Mine has strawberries, blueberries, ice, and a tsp of sugar.
The fruits are the same in each smoothie, so there's no need to consider them in the discussion about sugar.
What is DIFFERENT in each smoothie is the ADDED SUGAR. Lets say all our fruit adds up to 15 grams of sugar each. I add white sugar (4 grams), LL adds 4 oz. vanilla yogurt (16 grams), and you add soy milk (you didn't say how much, so I'll give you 4 oz at 4 grams) - this, of course, is me assuming that your soy milk and LL's vanilla yogurt are not sugar-free.
So in addition to the sugar in our fruit, we're all adding EXTRA sugar. I'm adding white sugar, you're adding milk containing sugar and LL is adding yogurt containing sugar (again, unless you're both using sugar-free products).
I don't know how to make it any plainer than that.
