They do not eat and they can not be forced to eat unfortunately so if you tame it it is a temporary tame it will die but and I mean but there is one way to keep them alive if you play on your phone like I do I have the god consul if you turn on infinite stats and mount the titan it will reset the food clock to full food again when unmounted it will slowly go down but with a quick remount it will fill the food bar and boom it will never starve or die

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