One tip I was taught is to do outside supermarket shopping - where you only go round the outsides - and avoid the middle as that's where all the processed stuff is etc.

One thing WW taught me which helped was keeping a food diary and writing down everything you eat each day, you'd be surprised at what you are eating and you'll get a bigger picture of where to change what you are eating.

The pregnancy one - no brie, alcohol, runny eggs, rare steak - squashed stomach = smaller portions. So far is worked a treat less than 1kg gained in 5 months.

The part of WW that worked for me was attending the regular meetings, I couldn't put things off till later as each week the scales would show how well I'd done.

The only thing that really works of course is to eat plenty of fruit and vege, lean meat, chicken and fish.
Reduce fats, sugars and alcohol and increase the amount of exercise you do.
It can be tough its the only long term solution to premanent weight loss and weight management.