Would it help if you planned out all of your meals and snacks ahead of time? I think that really makes a difference. Not many people plan out "Doritos with bean dip, M&Ms, and pudding" in their meal planners, I bet.
When I go to get an unplanned snack, it's not such a thrill when the pantry just has canned beans and tuna and Ak-Mok crackers and the refrigerator has Fage yoghurt, goat cheese and fruits and veggies.
You may want to consider joining a "stroller strides" class or other "mommy & me" exercise class. Also, you can check out clubs for stay-at-home moms and their kids, such as MOMS Club ( www.momsclub.org/welcome.html
). If they don't already have an exercise get-together on their schedule, you can start one!
Remember the flight attendant spiel: "secure your mask first."