It's not a question of being fat. They're just not as good as they were 4 years ago.
I dont think the team they had 4 years ago if that much better than the current crop, it's more to do with the rest of the world developing their games at a quicker rate than England. They won the world cup, I think they lost their motivation to improve, unlike New Zealand who are far more hungry for success. Like Rocky 3 with Clubber Lang! You get what I'm saying?