Body suddenly does not like Sweet Potatoes...

Being unemployed, I found having a sweet potato (pretty much) every day for lunch delicious and cheap as hell.
Lately my tummy has not been happy with this. At all. Can't tell if it is from sweet potato eaten hours earlier or the day prior. Sweet potatoes blend together just like the days of my unemployment.

Does anyone else have an experience like this.. eating something every day and then suddenly your body doesn't want it/can't handle it anymore?