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I plan to drink Honey as my source of glycogen for a Ultra Marathon of 80 Kilometers and 4400 meters D+, I'm planning to do it between 12 and 14 hours, so my question is How much milliliters of Honey would I need?

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    This question appears to be off-topic because it is extremely narrow and hard to imagine it could be relevance to anyone else. Also extremely difficult to answer accurately. – Eric Oct 5 '14 at 21:47
  • @EricKaufman - Why on earth would you vote to close and then answer the question? – JohnP Oct 6 '14 at 19:37
  • @JohnP I answered it first, then reviewed the criteria for closing, and thought it was pretty narrow and constituted a close vote. – Eric Oct 6 '14 at 19:51
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    @EricKaufman - Fair enough. Just seemed odd. :) – JohnP Oct 6 '14 at 20:50
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    Long distance nutrition seems pretty on topic. This is a concern for anyone doing long distance since a marathon is at or above the body's limit for energy storage per popular opinion. "Difficult to answer accurately" is exactly why this should be an open question. – Jason Jun 28 '15 at 15:33
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So that's:

  • ~50 miles.
  • 3.8 mph (50/3.8 = 13.2) or 16 minutes/mile
  • 792 minutes (13.2 * 60) = 4,391 calories (for a 170lb average person)
  • Honey generally has 21 calories per 5ml, so that's 3 calories per ml.
  • 4,391 (total calories) / 3 (calories per ml) = 1,463 ml.

Feel free to double check my math on all of that, and it's based entirely on the average of a 170lb person. Training, altitude, terrain, weight, temperature, and other factors affect this greatly.

Your body is also capable of storing, with carboloading, roughly 2,000 calories so theoretically you don't need to ingest 4,391 additional.

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    fine the calculations, but where is the fact that the body can just absorb calories from 240 to 280 per hour? – Artemination Oct 6 '14 at 13:06
  • @Artemination - This is just basic calorie math, and pretty much irrelevant to your personal situation. Some people can't absorb honey without a lot of water, people's calorie absorption rates vary wildly. The best way to find out is to use honey in practice and see how you feel. – JohnP Oct 6 '14 at 19:39
  • Heart rates provide another source for calorie loads and takes "effort" into account. I'd say you'd need about 6000-8000 calories for an ultramarathon, but it takes calories to burn calories and its hard to process this during a run. I'd like to hear some ultra marathoners and training specialists answer this... – Jason Jun 28 '15 at 15:40

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