How much is too much sugar?

[Guest guest]

I bought a Magic Bullet today so that I can make myself protein

drinks. I'm using the Nutribiotics Rice Protein stuff that doesn't

taste good in anything, but it's tolerable, and I'm mixing it with

rice milk and fruit. The rice milk I have in the house now is

flavored with vanilla so one serving of 8 ounces has like 17 grams of

sugar in it. I also mixed in four strawberries and half of a banana

which also provide sugar. I'm guessing that I shouldn't be consuming

so much sugar but that I can get away with it earlier in the day, but

not all day. I've also been eating organic raw protein bars that also

have anywhere from 17 - 23 grams of sugar in them. My question is how

much is too much?