I don't usually reply to threads here.....basically a lurker. But, I sense alot of myself in your post.
When given the instruction to adopt a healthy lifestyle, I was at a loss. What exactly does that mean? I think it means different things to different people. I found it takes trial and error to figure out what works for us....not everyone else. My plan is probably not your plan (if you get what I mean).
The previous poster has found success in a very low calorie restricted diet, and I think she is lucky to have found something that works for her! I am glad for her success!!

But, on the flip side of that, it wouldn't be the plan for me! I initially found success in a physician controlled low carb diet (with that plan I discovered carbs cause me alot of issues! Never knew that before!). The low carb diet was successful for me until I started running/racing, then I had to work things out to increase my carbs to sustain my exercise! So, it was a work in progress to come up with a plan that continues to work.
I have found that sticking to my weight loss involves alot of forgiving myself for eating things I shouldn't eat. I stop, forgive, and get back on my plan right away. Don't let it go on for the day, or week or month.....don't have an "all or nothing" attitude. We are never going to be perfect....as long as 85% of the time I am on plan.
Exercise is key factor for me. A diet is temporary, and easily forsaken. When I started on my low carb diet, I also started to walk 30 min every day before work. EVERY day! I didn't miss a day. I didn't realize this at the time, but it was the best thing I have ever done for myself. After 6 months, excerise became a habit.....like brushing my teeth. I had to get it done, or I felt bad. I would never leave the house without brushing my teeth.....exercise became the same thing. After 6 months of walking, I got to a plateau and started to run a little. A little became more, and the next year I started doing 1/2 marathons! (I do have my dsis to thank for the first one.....I needed alot of prodding). I have just completed my 15th 1/2 marathon and have done 1 marathon.
My initial weight loss started in 2005. I lost 70 pounds in about 1 year, but marathon training I gained some back. The beginning of this year, I buckled down and got back to it. I have exercised every day of this year, and now down 33 pounds. Total weight loss is now 75 pounds from a high of 231 pounds. I am 5 pounds away from my initial goal of 150. ( I never got there last time).
Every day is a new day. I have the same goals every day, and I just have to make the time and effort to get it done. Make yourself the priority. Make sure you eat right. Make sure to exercise for 30 min EVERYDAY with no excuses. Do that long enough......and you will continue to do it for a life time. (((((((and LOVE it!))))))
Beth