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    That's a good example why I like physicists. Yummy, more oil cooking!
    – Wills
    Commented Apr 23, 2014 at 21:28
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    Butter might come close to optimal as well. Commented Feb 17, 2015 at 21:31
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    I had thought olive oil, its certainly a good boost but couldn't imagine anyone surviving solely on it. How about peanut butter, 5.8 cal/g, 50% fat, 20% carbs, 25% protein. Used (with a few additives) by the WTO to relieve famine. Commented Feb 20, 2015 at 2:49
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    Just bring peanuts... They are around 60-70% pure fat, and tasty. :)
    – fgysin
    Commented Aug 11, 2015 at 10:09
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    Pure fat would be most efficient only if you can metabolize it all, which I suspect you can't. In The Worst Journey in the World, Cherry-Garrard wrote "[our calorific] requirements are calculated for total absorption of all food-stuffs: but in practice, by visual proof, this does not take place: this is especially noticeable in the case of fats, a quantity of which were digested neither by men, ponies, nor dogs."
    – Pont
    Commented Apr 5, 2016 at 12:06