Thanks for the replies gents.
Ian, I’m actually planning on starting with the medio fondo which I think is 95 miles. I’m not entirely sure how much climbing but from the elevation drawing it looks like a fair bit so, as I’m still relatively new to it all, I didn’t want to over do the first one!
I have a friend who does long distance races in a canoe, eats a very low carb diet and fuels up on race mornings with a shake of full fat milk, double cream, raw eggs and a banana. He says that’s all he needs to do 250 km and the guy paddles really hard so I know it can work but it’s nice to get some info from cyclists too.
Mark, I’ve not tested my ketones before as I have never really taken that side of it too seriously. My main reason in keeping low carb is to keep overall sugar in my body to a minimum. Particularly with all the information coming out about an excess of sugar being linked to cancer, Alzheimer’s, osteoporosis etc