Well....if you have will power and a damn good excuse you can stick to Anything ...but it is harsh on a Foodie.
We Kinda Similar here.....meat and veg or salad......we don't eat processed food...coz most has gluten in.........and a lot of gluten free alternatives are expensive and pretty poor.
But I would be gutted if I coldn't have a lamb chop or a steak every now and then.
I Can make 1,000 Tasty meals outta frozen chicken portions.........but I look forward to getting a Treat when the pension comes in....