For me, Raymond's wife was the key to the story. She was trying to keep a level of civilization - and civility - going on in a world where that's no longer possible. She knows - though we don't - why this is the case. But she's determined to try. Yet, as the ending shows, she was was not at all surprised when that failed. She knew Raymond tried his best to avoid the outcome, but ultimately, she knew that violence was a likely outcome, and she was neither angry nor shocked, just saddened.
I think that fact spoke volumes about the state of the world.
On the flip side, I found Ford's behaviour puzzling. Hunger is a powerful motivator, but he didn't act like he was starving. He acted like a bully, even though he was never in control of the situation, and he knew it. I guess he thought that Raymond wouldn't actually shoot him - but there were plenty of opportunities to get the best of Raymond without making an overt move while a shotgun is pointed at him.
Also, a diet of nothing but fish and apples is probably one of the healthiest diets one could choose. If coupled with an active lifestyle, and neither fish nor apples are too scarce, I'd expect someone living on it to look quite healthy indeed.