Alcoholic drinks have a shit ton of calories, but I personally know many skinny people who drink an insane amount of beer & liquor. Even if they didn’t eat anything, the calories from the drinking alone should be enough for them to put on weight. How come they don’t? Does the body lose it’s ability to take in the energy properly if it’s mostly coming from alcohol?
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As you become an alcoholic, you mess up lots of systems in your body, including digestion.
Most long term alcoholics that are thin, is due to a combination of not eating a lot of food, they spend money on alcohol. And getting to the stage where they are not able to digest food, malnutrition and chronic diarrhoea are common in severe alcoholics.
Overweight alcoholics do exist, but they are usually in the class of functional alcoholics. If they are functional enough to hold down a job and pay bills they may not even be recognised as alcoholics by the people around them. So some selection bias may be taking place.
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