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If you chug down 3 lites of vegetable oil, and it somehow all ends up in your lipid stores rather than giving you an unpleasant visit to the ceramic throne, you gain at most 2.8 kg.

This may indeed take months to shift, but it's not even close to the maximum possible damage to someone's finances from gambling.

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Your number is exactly correct (1.4kg/day) [1] but you can easily do it without oil as they did in the study (there are a lot of waking hours in the day and a lot of good fatty foods.) Alcohol (and some medication) of course makes both storage and consumption easier.

1. https://pubmed.ncbi.nlm.nih.gov/7598063/

3 lites of oil is approximately 10 times the recommended calorific input for adult men; it certainly isn't "easy", on the basis of what I've heard from a now-long-deceased acquaintance with cystic fibrosis who was required to consume 10,000 kcal/day just to overcome the medical condition; and 10,000 kcal/day is less than half the amount here (24,436 kcal), which I chose on the basis of it being a lot of fluid to drink in one day even if it was water.

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