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Has anyone combined fasting with intense physical activity/exercise? I enjoy long runs and HIIT workouts, but when I've gone straight into a workout after work before dinner, I always seem to lose energy and feel horrible. Would working out during fasting make this worse?

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Wouldn't recommend fasting for HIIT or any super intense activity, but the long runs may improve. I'm saying this since sugar is a lot quicker to be transformed into energy by the body than fat.

But we're all different, so, you could give it a try :).

I have done multi-day backpacking trips while just consuming water, green tea and some nuts/dried fruit once a day. I was fine. I had plenty of energy each day.

How many kilometres did you walk and how much of the trail mix did you consume each day?

I backpack about 10-12 miles (19.3 kilo). I ate about 17oz of fruit and dried nuts each day. Now, I am adding 1/2 cup of oatmeal in the morning.

I know people that backpack the same distance and they are consuming 4000-5000 calories per day!

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