When I was a kid in the 60'2, I went to a Catholic School. We were encouraged by the Teachers to give something up for Lent. I suggested that it would seem to be a good idea to give up sprouts, cabbage and liver, as I was always being told that these, although horrid, were "very good for you", so giving them up would be a big sacrifice.
I was told that I wasn't playing the game and should give up something I liked, rather than hated. I was sure that my logic was unimpeachable but I was sadly not able to convince any other grown up !