think about the transitory hevel pleasure you have from the food, which is over as soon as it is swallowed.
think about the damage you do to your body by eating indulgently, both short term (bloating, discomfort, stressing the digestive system) and long term (heart, arteries, diabetes)
think about the training in controlling your tayvahs you are providing yourself, and improvement in your Middahs in general
think that the food you were strong enough to avoid eating is a gift to Hashem.
think that you will continue eating like a Yid and not a Behemah for the days between R’H and Y’K.
think about these things before you eat, not after.
really stop for just a moment and think about it, right after HaMotzi