What helps me is have my favorite healthy foods on hand at all times, and I feel it's the little things that I stuck to that have helped me.
Right now my healthy addiction is oranges & bananas. If it was possible to OD on oranges, I totally would have last week :) Summertimes it's spinach salads, tuna salad (non-fat mayo!), and melons.
When cooking, I add butter to veggies and pasta last, and do it only on FI & SS's plates, not mine. I up the sizes of starch & protein for the boys, and do more fruits and veggies for me (FI needs to actually gain wait.. lucky boat he's in...)
Plus, I take every opportunity I can get to be active with SS who's three. It helps that he has lots of energy, so he's a good motivator. I help him burn it off by racing around the house to get chores done ("I'm gunna beat you to the bathroom!"), and if he's just really antsy, we'll count to 30 and do jumping jacks.
DS loves to fly up in the air, so if I'm feeling lazy, I'll toss him around a bit. A live 25 pound weight really gets your heart beating quick!
GL.. hoping you find your healthy balance!