I think it's easier to restrict, mark certain foods as off-limits. I find it difficult to stop at a moderate portion when the food is right there. Constantly tasting a bite of the food here and there is just reminding me that it exists and keeping it at the forefront of my mind. If I decide a food is off-limits, then that is the decision being made and I don't have to revisit it or renegotiate every time I see the food in the kitchen.