I’ll let the debate about what to eat run s I’m no expert (but do find a higher pritein diet + lots of veg the easiest to live with).
I had exactly the same issue as you, bottom half ok, top half shocking.
If you want to get this done you need eat less calories, by 500-1000 a day. That’s going to take a bit of adjusting to and that’s the tough bit, even if you go for the ‘best’ diet.
I found that I had to make a project of it, really focus for a few months on dropping the weight. I had a really positive mental picture of the slimmer me and I would picture it when tempted to overeat. Weight yourself, I think weekly is as frequently as you want to go.
Take a look at some of the stuff by Tom Venuto – I’m not advocating the nutrition / exercise he prescribes but the mental aspect is IMHO bang on.
phinbob (well nearly) (used to be fatbob).