I just had a iced latte with sugar free syrup but I reacted a bit. I had a reaction a bit like a dumping syndrome episode in that I felt a bit weak, heart palpitations but I didn't feel sick or have tummy cramps or the runs like I have done in the past. It's eased a bit now but that wasn't nice. I even asked for skimmed milk. I've had that before where I've had sugar free syrup and wonder why that is. Not a happy puppy.