Alzheimer's, and more obviously, recurring litter in my yard.

As if we needed yet another instance of the high cost of low price ...

Alzheimer's could be the most catastrophic impact of junk food, by George Monbiot (Guardian)

... Even if you can detach yourself from the suffering caused by diseases arising from bad diets, you will carry the cost, as a growing proportion of the health budget will be used to address them. The cost – measured in both human suffering and money – could be far greater than we imagined. A large body of evidence now suggests that Alzheimer's is primarily a metabolic disease. Some scientists have gone so far as to rename it: they call it type 3 diabetes.

New Scientist carried this story on its cover on 1 September; since then I've been sitting in the library, trying to discover whether it stands up. I've now read dozens of papers on the subject, testing my cognitive powers to the limit as I've tried to get to grips with brain chemistry. Though the story is by no means complete, the evidence so far is compelling ...

... Plenty of research still needs to be done. But, if the current indications are correct, Alzheimer's disease could be another catastrophic impact of the junk food industry, and the worst discovered so far. Our governments, as they are in the face of all our major crises, seem to be incapable of responding.