How do you stay on track?

Ultimately it is about you. For me I have to do a lot of planning, cooking and logging. It's a daily routine. My family eats "bad" food (lots of sweets/fatty foods) but I know I can't eat that stuff. I will balloon to 250 in a heart beat and coupled with depression it is a very very bad place to be in for me. I have to turn down those types of foods as they do nothing for my body. Dragging my *kitten* to the gym at 3 am on those lonely and cold nights is the hard part.

Plug your stats into MFP, eat at moderation and try to exercise. That's about it. In the end it is up to you. Good luck.

I tried to get my mom to eat least cook and eat a little healthier but, her excuse was "I don't know how to cook any other way and I like what I eat." I have no support. She buys sodas (luckily her favorite is ones I hate). My thing is, she is constantly offering me junk food and food that will hinder my success for me. I cant just eat one cookie. It'll turn into a whole package. She just says "oh you'll be fine just eat it."
When she cooks and eats, I stay in my room. I have my food in a seperatd area in the food and freezer and i eat at the same time everyday (at a different time from mom.) I just had to distance myself from her to work on my weightloss.
(Even when i went vegetarian for a while in highschool, she would push meat in my face and be all sing song saying you know you want it. Rude.) I say distance your self. Go on walks. Cook at different times. Pick up more hobbies. Prepare meals for the week so you wont have to be in the kitchen as much.

Try making small changes where you can, like having one piece of whatever instead of two, choosing the corn instead of fries, having some fruit instead of chocolate or dessert. Just try to take it day by day and log your food as best you can.

My adult son and his family live with me and since I buy groceries and cook they eat what I prepare, although definitely in different quantities. For instance I always cook a starch at dinner and eat 1/2 cup of it. My son eats 2-3 cups of it (he is thin and works in construction). They do go out and buy their own "junk foods" sometimes which I don't touch. I'll buy regular ice cream for him and low cal for my dil and me. I buy myself nuts or beef jerky for healthy snacks and he eats them. Those are things you can keep in your own space. Sounds like you'll have to pick and choose what you can eat that your mom cooks and try to talk her into letting you take over at least a few times a week (I personally love it when my kids cook and especially clean up afterwards-usually breakfast). Actually you can probably eat pretty much any food in small quantities and then supplement with more vegetables if you need. Keep something like beef jerky or deli meat on hand if you need to add in some quick protein that's missing. It might be harder and take more will power but you can do it. If you don't eat the junk your mom buys eventually she'll get the idea. Old habits die hard.