apples
With the skin ... usually 3 months post operative. If you are going to peal it and eat without the skin, then you can probably have it 4 weeks post operative. If you puree it, or eat it in the form of applesauce, then, probably 2 days post op.
It's really the high fiber than can irrate your new anatomy (provide you've had WLS).
Hope that helps.
Sara Nejat-Bina, RD, CNSD, CDE