Zero calories in a 50k race What will happen

Sometimes I get an athlete question that has me scratching my head and saying... WTF!! Today is such a day.

We have an athlete that seems to be a new convert to fat adapted running / ketosis / banting diet and lifestyle. He wants to know what will happen if he runs and entire 50k race - at race pace - while in ketosis and not take in an ounce of nutrition the entire way.

This video explains what I believe will happen when you race competitively in a state of ketosis.