Everyone, especially if they have diabetes needs to find out from their doctor if they can have an artificial sweetener and in what quantity. Everybody's case is different with diabetes. I have a mild form that I watch very carefully and know where my limits are.
I think if one cheats by eating sugar in any form tends to lead to wanting more sugar.
The best exercise for one not gaining weight is push aways from the dinner table.
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).