People of my age group and older, were brought up to believe that terrible things would happen if a person went swimming moments after they had eaten. Responsible parents gave their children at least an hour after lunch before letting them in the water. These days we all have the internet. We can research the truth (or otherwise) of such ideas and adjust our attitudes accordingly. Somewhere in your world now, there is something that you think it is not OK to do. But it may well turn out to be perfectly acceptable.