[JonMR]

Tracking food intake for several months helped me immensely. You may want to track carbs, fat, protein as well as calories.

Once you cut the junk food out of your diet, it's easier to keep it out. The cravings for sugar subside.

I go through on/off periods with weight lifting, but generally try to lift at least once a week.

Apart from that I try to get outdoors with some kind of physical activity 2-3x a week. I've been lucky to find a few physical hobbies I enjoy. I used to wake skate / wake board on the weekends and mountain bike during the week. Mountain biking has now taken over the weekends as well.

That would be my biggest recommendation. Find a hobby you really enjoy that keeps you active.