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Here is one extract that I found about
http://dl.clackamas.edu/ch106-07/carbohyd1.htm
Another one
https://www.google.com.py/amp/s/fit...s/archive/2012/08/10/amp/fat-not-glucose.aspx
There’s a shit ton of articles sayign the same thing, as normally there’s different opinions on the matter, From my experience, I don’t need to load up on carbs to have enough energy to grapple, at all...
Very unlikely that you are in Ketosis if you are consuming a normal amount of carbs (say above 100g per day)
Your body has to deplete the reserve of glycogen (glucose) stored in your liver. Then you will enter ketosis.
Ketosis is the state you are in when your brain switches from using glucose as its fuel source to using ketone bodies, if there is glucose readily available the brain will use that as it's preferential fuel source.
This would explain why you and the rest of the BJJ squad are not seeing a performance drop off from fasting, you're still using glucose for fuel as the carbs you are consuming are getting stored in your muscles as glycogen.
That could be... I don’t know, but what I do know is that I train at noon, and I fast from 8 pm... most of my clase mates fast 20/4... I do 16/8...