Sometimes a simple mental check works for me, like asking myself "Will this help me reach my goal(s)?". I use this for my problems with eating badly and not exercising. I want to eat better and feel better. So, when tempted, I ask 'If I eat this, will it help me reach my goal?', or if I am making excuses for doing something (eating this) or avoiding (skipping exercise) the question can help me reaffirm my desires and goals and think more about what I'm doing.