Chronic alcoholics can suffer from a disease called “Korsakoff’s Syndrome”.This syndrome,IIRC,causes substantial damage to the brain but isn’t caused directly by the alcohol itself.Rather,it’s caused by a vitamin deficiency seen in people with chronically poor diets and many chronic alcoholics surely do have abysmal diets.Another group that was affected by Korsakoff’s is concentration camp survivors,many of whom *also* had chronically inadequate diets.
I know a guy like that. He can drink for days without eating and says eating will just make him tired. He prefers to drink instead.