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>you. The difference between running in the morning fasted and running after eating a single banana is the difference between feeling like you are being torture

>you. The difference between running in the morning fasted and running after eating a single banana is the difference between feeling like you are being tortured and being able bounce around like a bunny. This seems really wrong for the vast majority of people. Is your average person really bottlenecked by their blood glucose levels and not say, cardiovascular health or lung capacity? I think most people get winded in a hard run way before their muscles are low on energy and they are feeling sluggish, no?

marcellus23 3y ago
I think the assumption in that sentence is that you're already someone who runs, so you already have decent cardio fitness. And if you're a runner, yes, you can notice a massive difference between running on an empty stomach vs. running with some carbs in you.
brigadier132 3y ago
From what I understand the vast majority of people have very low metabolic health and their ability to use fat as energy during exercise is not well developed. Meaning they are almost exclusively using glucose and glycogen. From personal experience, when i was untrained, i could feel if i was fasted or not. Additionally if i did not eat some form of carbs 40 minutes into my workouts i would crash and burn but if i had a small gel pck i could go for another hour. I dont know the mechanism for how to glucose would even be absorbed that quickly but i did feel a noticeable boost in energy as soon as i consumed the gel. I think there is some connection between the digestive system and the brain that signals that you can use more glucose immediately after consuming food.
- brigandish 3y ago
  This can be replicated without consuming any glucose, by simply washing something carbohydrate around the mouth. It's called the "Carbohydrate Mouth Rinse"[1]. If I can summarise, from memory, it tricks the brain into thinking more fuel is being added so it's okay to release more of the stored fuel it was holding back. > Routinely rinsing a carbohydrate-containing solution around the oral cavity for between 5-10 s has been shown to improve high intensity endurance performance lasting 30-70 min. > The magnitude of the performance benefit is similar to that of carbohydrate ingestion, although athletes who are prone to gastro-intestinal (GI) distress during high intensity exercise may want to consider rinsing because of the reduced risk of GI discomfort. > These effects appear to be specific to carbohydrate and independent of taste or sweetness. [1] https://www.gssiweb.org/sports-science-exchange/article/sse-118-carbohydrate-mouth-rinse-performance-effects-and-mechanisms https://www.gssiweb.org/sports-science-exchange/article/sse-...
watwut 3y ago
My experience is yes, absolutely. As in, the inexperienced beginner will feel the difference faster and more then someone in shape who runs often. Meanwhile, your body if you run often will handle lack of glucose in blood much better, at least subjectively.
peterfirefly 3y ago
I could tell the difference on a 10km run. The difference was around 10% extra time + a feeling of my legs being heavy. No "torture", though. It wasn't 100% predictable -- sometimes I felt fine fasting (and ran fine).

marcellus23 3y ago

I think the assumption in that sentence is that you're already someone who runs, so you already have decent cardio fitness. And if you're a runner, yes, you can notice a massive difference between running on an empty stomach vs. running with some carbs in you.

brigadier132 3y ago

From what I understand the vast majority of people have very low metabolic health and their ability to use fat as energy during exercise is not well developed. Meaning they are almost exclusively using glucose and glycogen. From personal experience, when i was untrained, i could feel if i was fasted or not. Additionally if i did not eat some form of carbs 40 minutes into my workouts i would crash and burn but if i had a small gel pck i could go for another hour. I dont know the mechanism for how to glucose would even be absorbed that quickly but i did feel a noticeable boost in energy as soon as i consumed the gel. I think there is some connection between the digestive system and the brain that signals that you can use more glucose immediately after consuming food.

brigandish 3y ago
This can be replicated without consuming any glucose, by simply washing something carbohydrate around the mouth. It's called the "Carbohydrate Mouth Rinse"[1]. If I can summarise, from memory, it tricks the brain into thinking more fuel is being added so it's okay to release more of the stored fuel it was holding back. > Routinely rinsing a carbohydrate-containing solution around the oral cavity for between 5-10 s has been shown to improve high intensity endurance performance lasting 30-70 min. > The magnitude of the performance benefit is similar to that of carbohydrate ingestion, although athletes who are prone to gastro-intestinal (GI) distress during high intensity exercise may want to consider rinsing because of the reduced risk of GI discomfort. > These effects appear to be specific to carbohydrate and independent of taste or sweetness. [1] https://www.gssiweb.org/sports-science-exchange/article/sse-118-carbohydrate-mouth-rinse-performance-effects-and-mechanisms https://www.gssiweb.org/sports-science-exchange/article/sse-...

watwut 3y ago

My experience is yes, absolutely. As in, the inexperienced beginner will feel the difference faster and more then someone in shape who runs often. Meanwhile, your body if you run often will handle lack of glucose in blood much better, at least subjectively.

peterfirefly 3y ago

I could tell the difference on a 10km run. The difference was around 10% extra time + a feeling of my legs being heavy. No "torture", though. It wasn't 100% predictable -- sometimes I felt fine fasting (and ran fine).