What is easier to do - fasting (no food) for 48 hours or completing a marathon of 88km in 12 hours?

walking on the Ultra What would you choose? Would you remain without food for 48 hours (you are allowed coffee and tea with milk, but no sugar and electrolytes) or would you run or walk 88km within 12 hours? Running for 12 hours? I managed to complete my ten Comrades Ultra Maraton on Sunday 11 June 2023. It seems easy if you type it in one line, but it was not easy. I started off at a fair pace and kept up with the pre race plan. I took a huge shake with much extra carbohydrates in the mixture shortly before the race started. I had three more snacks to eat and then,,, the almost unthinkable happened... I could not stomach any of the supplies that I packed and that I carried with me. I started eating one chocolate protein bar and battled to chew it and battled even more to swallow it. The body just refused. I could not understand why this was happening. My nutrition the previous day was fine. I was used to the type of shake I took early. I was running out of energy and then ...