This video is from Apri 12th of 2016, but forgot to upload it.

25h ago I stopped my food intake. If it goes as planned I will hold on that until next Saturday after running 40k.

I’m trying to see how much its possible within an state of Ketosis.

It will be my second attempt. I tried already few weeks ago. But I did it in an unknown terrain and my feet got to beat up. That time I end up running 22k after 40h of no food intake.
https://www.strava.com/activities/419032065

90% of my runs in the last months have been while in Ketosis, and in the last weeks I’ve experimenting on running without food intake in the previous hours.

A couple of weeks ago I ran a 24k race after 30h of no food intake.
https://www.strava.com/activities/428479187

For the last two years I’ve been facinated with ketosis. This thing that makes you feel like a super human, everyone can trigger just by not eating the crap they sell us, or just by not eating at all, and for some reason not may people care about.
I’ve experimented with it all this time, the last months specially focused in reducing food intake and starvation.

During all this time  I haven’t found many reports on people doing long distance running while in ketosis. Even athletes known for its paleo style nutrion like Timothy Olson makes use of carbs on pre-race and race intake.

And I don’t understand. If ketosis uses your fat as fuel and you have enough fat, why do you need to eat at all during a long distance run?
The brain needs glucose to run. That could be a reason. But how many? Is that why no one runs in starvation? I haven’t found any relevant data in the subject.

Recently I ran 22k without eating for two days, and even a 24k race without eating in the previous 30h. And of course no gels or anything during the course. I felt great!

Were my previous test not tough enough? Am I missing something? Or its actually possible to run in complete starvation for really long distance. 

That’s why I’m planning to run 40k without eating for 3 and a half days prior the run.

For the last 10 days I’ve been over eating with no filter (including all sorts of carbs and sugars). Just for building up some fat.

I don’t know my metrics of a couple weeks ago as I didn’t have how to mesure my weight and body fat.

Yesterday I got a new scale. An Omron HBF-212 that mesures body fat. The accuracy of  bioelectrical impedance scales its not high but if mesurements are taken in the same conditions the difference between contiguos results should be pretty reliable.
I’ve been looking for a body fat calipper as well, but haven’t been lucky so far. I’ll order online sometime soon.

My current weight this morning was  74.6 Kg with 13.7% of body fat.
From now one I’ll be taking mesurements on the regular basis.

This is the planned route:
https://www.strava.com/routes/3670703

I know the terrain pretty well on the first half. I don’t know the second half but its the easy one.

The furthest I ‘ve ran in the last two months its 29k. But I believe I added enough volume to face the 40k. Last October I ran about 200k, 90% of it barefoot. This November its been more quite as I rested for the race and for the current experiment.

My biggest fear are cramps. 
I’ve been having a lot recently. And I haven’t recovered from a race I did a couple of weeks ago. I got very strong ones on the last few km. My calf muscles still very sore (its never been that bad before).

Today I got a foot and leg massage. My feet are amazing! No pain at all. My legs though… they are pretty fucked up. When massagin the deep tissue on my calf it was a torture…

I’ll be running after almost 4 days of not eating. That means I have to get all the electrolytes from drinks. And of course, I’m not going to drink any energy drink or artificial salts.

I’ll do my best to stay well hydrated. Will use some of the streams on the mountain for the first half (there is no other reliable source of water) and coconut water with table salt that I’ll bring on my hydratation belt.

At the km 25th I’ll be back to urbanized area and I’ll be able to get water from 7eleven. Probably will be a good time to rest a little bit. Maybe even get a swim if the weather its nice.
After that should be easy.From that point I can also get a cab or a bus in case something goes wrong.

I will attempt it to do it barefoot, but I’ll put back the huaraches if I’m suffering to much or I’m going to slow. The whole thing its to extreme already, but I know the terrain and it should be doable…

The pace will very slow. I’m expecting the whole run to last between 6-7hours.

This is the plan. It looks beautiful on the screen. Let’s see how much I get right… I have to say I’m a little scared.

On my main blog I just wrote some conclusions:
Running 50km after 82h of fasting. My conclusions.