Good Gravy, what happened to him in the interwar years? I doubt he could even fit into the cockpit by 1939.
Shot in the leg during the Beer Hall Putsch. The wound never healed properly, and he became dependent on opiate painkillers. Codeine pills - he didn't inject morphine or heroin.
Between the pain-enforced inactivity and generally getting older, he put on all that weight.
He acknowledged it, though, and told the following joke on himself.
A man walking along a street in some German city sees a group of urchins acting a bit odd. They are marching back and forth, saluting, and so on. He stops and says, "What are you doing, boys?"
One of the urchins answers, "We're playing Nazi Party. We even have all the Nazi leaders!" He points to three piles of dog poop, and says "See, there is Goebbels, there is Hess, and there is Himmler."
"Very good," says the man. "But aren't you missing somebody important? Where is Goering?"
"Oh," says the urchin, "we couldn't do
him. We don't have enough dog poop."