Is partaking of the Holy Eucharist the key to incorruptibility of the saints?

*The Incorruptibles* by Joan Caroll Cruz has many stories about incorruptible saints. These saints with incorruptible bodies are Catholic, and I never heard any Protestant, other non-Catholic Christians, or even other religions claim they have members whose bodies are incorrupt. Does the Catholic Church have a good explanation on why this is? Does the Holy Eucharist have something to do with the incorruptibility?