Take 2 kilograms of sugar. Dissolve them in water, and add a bit of yeast.
Allow time for the yeast to turn most of that sugar into carbon dioxide and alcohol.
While drinking said alcohol, consider laws of thermodynamics.
Brewing alcohol is neither endothermic or exothermic. The energy stored as sugar turns into energy stored as alcohol. It's the same energy, but expressed slightly differently.
So if you consume those 2 kilograms of sucrose based energy, after they've been transformed into ethanol based energy, but get hardly any exercise, what happens?
That's right. I've gained several extra pounds in mass in less than a fortnight.
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