We joke at home that when we're on "fatness pal" then we can only eat dust and sand, which is what I assume you are referring to since everything has a barcode.

If you mean stay away from processed foods, then yeah readymeals and the like are best avoided. But pretty much everything has a barcode - raw chicken breast, raw fruit and veg, milk ... you name it - hell even salt and water have barcodes.

Err, I use MFP as well and I don't know what you're talking about.

Barcodes aren't only for whole meals, they're also food ingredients. When I cook at home, most of the stuff that goes into the recipe has a barcode.