I only changed two things:
I walked more. (Not running--walking, from 5-11 miles a day. I used to lift, and hopefully will begin again this week.)
I stopped drinking soda. I'm trying to drink only water, but I use milk and sometimes juice with whey protein for a meal a day.
I mention this because these changes were the very beginning of my attempt to lose weight, and they're things anyone can do. I hope to increase my exercise and eventually return to a regular gym schedule, and make more changes in diet. But in my case, I always tried to do too much, to change more than one thing at a time in terms of diet (cutting out numerous foods) and exercise (doing too many things).
These are very simple changes, and they've given results beyond the few pounds simply losing water retention pounds (I lost those long ago).
One very good simple thing: don't eat anything 3 hours before going to sleep.