because you didn't know that was in it at the time maybe??

And it can possibly cause the following side effects:
# bloating
# abdominal pain
# gas, sometimes painful
# nausea
# heartburn
# diarrhea
# headaches
# migraines (severe headaches)
# heart palpitations (fluttering, irregular heartbeats)

# shortness of breath
# depression
# anxiety and panic attacks
# spaced-out or drugged sensation
# joint pain, especially in the knees
# dizziness

Yay for Sucralose