I do most of my morning training fasted (even moderate intervals). Can I keep fasting after a low/moderate run/bike without compromising improvement?

Question

Jonny Bowden, PhD, CNS · Answer

Hey there. So the question is, the person does most of their morning training fasted, even moderate interval training. They want to know, can they keep fasting after a low, moderate bike run or run without compromising improvement, and I'll tell you my experience with that. I do all of my morning training fasted. I played tennis every day from 10:00 to 12:00 minimum, sometimes starting even earlier, so I do maybe two to three hours of tennis till noon, and I do it on an empty stomach or with bulletproof coffee or coffee with fat added to it. The most I'll do sometimes is a handful of nuts during my fasting days, and I can certainly continue to do that after 12:00. I usually wait till about 2:00 for my first big meal, but the measure that I always use the metric that I always use is how's my energy how do I feel. If I feel good, if I feel like I'm really on a roll, I'm in fat burning modem, my energy is OK, and I'm not feeling that drop in blood sugar. Sure, I can continue fasting after a low to moderate or even heavier workout. The ultimate metric for this is how do you feel. Are you improving? Do you feel energetic? Is your attitude optimistic? Are you kind of involved in and alive? Because that's the real test of whether something's working, whether it's a diet or a fasting program. It's how do you feel-- that's the ultimate arbiter. Don't deny the evidence of your own senses, because that will tell you whether what you're doing is working or not.

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"I do most of my morning training fasted (even moderate intervals). Can I keep fasting after a low/moderate run/bike without compromising improvement?"