Their mind should be in the right place, in so far as they realise that craving for such things is really the enemy to developing renunciation, concentration, and wisdom. They should reflect on the drawbacks (of samsara and of sense pleasures), and other than that, when the craving is strong, they just have to "suck it up and move on". Things are not always easy. Tge craving itself is the problem, not that fact that they cannot eat what they like.
Kevin