
Firstly alcohol ( which is also called ethanol) is produced by the fermentation of yeast, sugar and starches. It contains 7 calories per gram ( the second most calorie dense macronutrient after fat). And is a macronutrient in and of itself. When you drink this macronutrient especially in excess your body essentially treats it like poison. And prioritises digestion of it over your carbs, fats and protein.
One unit is equivalent to 10ml or 8 grams of pure alcohol. For instance a standard glass of wine is equivalent to 2 units or 20ml/16 grams of pure alcohol.
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