The reason why it is called "eat a peach", is because "eat a peach" is a quote that came from a guitarist named Duane Allman.
Duane Allman, said, "Every time I'm in Georgia, I eat a peach for peace,".
It's a quote which was a response to an interviewer who asked how he was helping the revolution.
So the band shortened it to "eat a Peach" and then used it as the title of the album to honor Duane's memory after his death.
Allman also said famously, "You can't help the revolution, becuase there's just evolution."
And the phrase "eat a peach for peace" is also believed to be a refrence to T.S. Eliot's poem, The Love Song of J. Alfred Prufrock.
And the album was also released after Duane Allman's death in a motorcycle accident.
The band decided to use his quote "eat a peach" as the title of the album to honor his memory and his artistic vision.
eat a peach is a double album that features both studio recordings and live tracks, which include some recorded before and some after Duane's death.
The cover of the album also features a peach, which further emphasizes the title's significance.