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There are 64 calories in 1 fluid ounce of Vodka (90 Proof). Calorie breakdown: 0% fat, 0% carbs, 100% protein.
For several hours after drinking the vodka, whole body lipid oxidation (a measure of how much fat your body is burning) dropped by 73%. The reason why alcohol has this dramatic effect on fat metabolism has to do with the way alcohol is handled in the body. When alcohol is consumed, it readily passes from the stomach and intestines into the blood and goes to the liver.