“It is very unlikely that Boney had hunger ödema - he just was eating immense
amount of food to obtain a beer keg belly. “

I’ve read various contemporary comments of observers of Napoleon’s appearance in later years. What sticks out to me are the comments on his extreme pallor, some mention a green tinge of his skin. There are several chronic diseases of the liver that can cause the symptoms he was suffering, altered gait, sudden onset obesity, confusion. His father died at a young age of “stomach cancer”, it could be that Napoleon inherited the disorder that killed his father. One that comes to mind is Wilson’s disease, the body is unable to manage copper and acccumulations cause liver disorders and abdominal cancers. Altered liver function can cause abdominal ascites, which look like a beer belly.