Oh, that's a completely different matter. From the title, I thought you were building a pantheon for your gaming world with a Dionysus-type food god and were wondering what kind of clash with other deities might make him do a U-turn on his portfolio and switch from indulgence to moderation.
This however, is highly dependent on the system you're playing in, and could range from having a friendly cleric cast Remove Curse to finding the Lone Hermit Atop The Mountain of Excess to send you on a long and involved quest for the One-Pronged Fork of Temperance. Did your DM/GM ask you to make suggestions? Perhaps start with finding more information about whoever made that cursed mantle in the first place.