The one that used to always get me was being hungry after work. For years I'd feed that hunger with booze, from when I walked in the door until an hour before bed. Now I try to keep ready-to-eat food (microwaveable sandwiches/burritos, chocolates, diet soda, boiled eggs, whatever) handy, or go straight to the bedroom and change, then go for a run, and eat after.
Tall glasses of water are good, too. Help kill cravings for food and booze.