Because they want really unhealthy, obese children?
I've just seen an ad for Iceland, the chav-friendly High Street chain. They're celebrating the fact that you can buy a load of additive-heavy reconstituted crap for a quid, so you can block the arteries of your entire family for less than a fiver. Bargain. They then have a shot of Coleen Nolan opening a bag of something that looks like stuff you'd put in a bird feeder but is, apparently, mince. Minced what though? Still, if you want a bag of mechanically recovered meat-like pellets for £2.50 for a coronary-sized bag... you know where to go.