Workout question

Answered on August 19, 2014
Created November 05, 2012 at 2:17 AM

I do CrossFit, usually in the afternoons, at around 6 or 7 p.m. I go without eating anything before, my last meal pre-workout is at 1-2 p.m. (max). My question is, is that enough "fasting" time to use my body fat during a workout or should I switch up and workout in the mornings, after I have fasted all night?

I have had great results with doing it in the afternoon, but I am curious to know if it is more optimal to do it in the mornings while fasted for over 12 hours?

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2 Answers


on November 05, 2012
at 05:06 AM

Your current 4-5 hour fast pre-workout is sufficient for fat burning, however, if your schedule permits, do it in the morning. You will benefit even further due to lower levels of insulin which promotes the release of FFA (fatty acids) to be released and utilized to fuel you through your workout.


Hope that helps.

Best, Deano



on November 05, 2012
at 09:37 AM

I've had good results towards being fat-adapted from running in the morning being fasted for 10-12 hours. I'm now at a stage where I dont really feel hunger anymore and can go for >12 hours fasting and still think clearly. I do believe there is some added effect to extending the fasting period beyond your 4-6 hours. At least that's what I've experienced after I've tried running both in the morning and doing a timing of lunch and workout as you. Please note that this is my personal experiences, as with everything there could be individual variability.

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