Warts are caused by a virus. It is possible that fasting may have helped a bit, but normally those type of effects are only reported by people that have been fasting for extended periods of time.

If you fast for several days, it is supposed to cause while blood cell count to drop and once you start eating that quickly restores. This has been reported in some studies. I don’t know of any data that shows that kind of impact with shorter fasts. So it is possible, it is also possible your body just won the war against the virus.

However, for most healthy people there can be many positive impacts from fasting besides just weight loss. So maybe starting some fasting did kick start something positive in your body. If so it is a great deal to have such a gain from so little effort!