I read this concept related to stoicism, related to pain. You can apply it to eating overly sugared Christmas cookies as well. Bite into it. Resist your initial revulsion and let the sweetness wash through your system. Let it consume your taste buds until they almost feel like they will explode, then – without force, but with curious awareness follow the path of the sweetness through your system. Down to your gut and along your spine, where it morphs into a sensation of shocked surprise.
Be observing, but do not judge. Take in every nuance of the emotion. Follow the trail of the sweetness with your inner eye and give it loving attention.
Along with the sweetness will come emotions of shame and fear of becoming fat. You will become acutely aware of your fatty tissue and feel your body very keenly. Also accept these feelings and let them wash through your organism, soul and mind like a tidal wave washes over the beach.
You will want to dissociate from these emotions or push them away. Do not do that. Persevere. Take it like a man, with relaxed amusement.
Eventually, you will feel the emotions fade away and vanish and can smile and thank your grandmother for the pleasure.