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From Fellrnr.com, Running tips
MCT
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** I started the run fasted, with my last dose of MCT at 2 PM the previous day.
** For the first 8 miles, I felt really good, with my heart rate and breathing where I'd expect them to be.
** At 8 miles I took 3 tbsp. of MCT with 2 tbsp. of Nutella. The Nutella was to prevent GI problems, as I've found that 2 tbsp. of MCT taken on its own can produce debilitating diarrhea. The Nutella contained 21g of sugar, but there is research that indicates that 50g of carbohydrate taken before or after a 20 Km/12.4 mile run at a fast (7:15 min/mile) will not impact ketosis<ref name="Koeslag-1985"/>.
** By mile 10 my breathing had become strained, and I had to slow up slightly to keep things under control. My heart rate was slightly higher, but not enough to explain the breathlessness. My breathing problem peaked at about mile 11, before gradually easing off, though it never returned to normal.
** At mile 19 I stopped for a drink and my blood pressure dropped dramatically. Even crouched down with my head between my knees I was dizzy. After a few minutes things returned to some semblance of normality and I was eventually able to stand up and continued to run.
<ref name="Jeukendrup-1995">AE. Jeukendrup, WH. Saris, P. Schrauwen, F. Brouns, AJ. Wagenmakers, Metabolic availability of medium-chain triglycerides coingested with carbohydrates during prolonged exercise., J Appl Physiol (1985), volume 79, issue 3, pages 756-62, Sep 1995, PMID [http://www.ncbi.nlm.nih.gov/pubmed/8567514 8567514]</ref>
<ref name="Van Zyl-1996"> CG. Van Zyl, EV. Lambert, JA. Hawley, TD. Noakes, SC. Dennis, Effects of medium-chain triglyceride ingestion on fuel metabolism and cycling performance., J Appl Physiol (1985), volume 80, issue 6, pages 2217-25, Jun 1996, PMID [http://www.ncbi.nlm.nih.gov/pubmed/8806933 8806933]</ref>
<ref name="Koeslag-1985">JH. Koeslag, LI. Levinrad, JD. Lochner, AA. Sive, Post-exercise ketosis in post-prandial exercise: effect of glucose and alanine ingestion in humans., J Physiol, volume 358, pages 395-403, Jan 1985, PMID [http://www.ncbi.nlm.nih.gov/pubmed/3884775 3884775]</ref>
<ref name="Kossoff-2011-1809">Eric. Kossoff, [http://www.amazon.com/Ketogenic-Diets-Eric-H-Kossoff/dp/1936303108 Ketogenic diets : treatments for epilepsy and other disorders], date 2011, publisher Demos Health, location New York, isbn 1-936303-10-8, Kindle Offset 1809</ref>
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