I took fruits during my confinement, encouraged by my mother although there were other confinement rules I had to abide to. I dont't recall any negative effects. Was BFing so I think it's important to be well nutritioned. I gave birth in May so the weather was VERY hot, and to have some fruits not only helped to cool my body, it also hydrated my body.
However, I know that some are against eating fruits during confinement as they may be too cooling for the body. If you want to avoid fruits, then I believe you can still get your nutrients from other food sources.