Thu, Oct-03-13, 10:04
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Senior Member
Posts: 3,025
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Plan: Optimal Diet
Stats: 00/00/00
BF:
Progress: 8%
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Quote:
Originally Posted by zmktwzrd
I have formed a hypothesis and would love your feedback. First let me say that it is logical that exercise stimulates hunger if you are burning glucose for fuel. You use up the glucose stores and then your body tells you to refuel, but if you are in ketosis is it possible it does not stimulate hunger in this same way? The reason is that rather than needing to eat to refuel your body can just access your fat reserves.
If this is not how it works, why? My understanding is that ketosis allows your body to access its fat reserves when it needs fuel. If your body can access its fat reserves then why trigger hunger? (bonking as Peter Attia called it)
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Because exercise above the resting state always, always requires some level of glucose too. When you're fat adapted, glucose lasts way longer and you're more efficient with it, but eventually you still need glucose to fuel exertion, and if you run out you'll get hungry.
I like to think of the car energy analogy. Fat is like gas, and carbs are like spark plugs. The more you accelerate, the more RPMs needing more sparks. Similarly, the more intensity, the more glucose.
There's a really neat article from sport science coach Alan Couzens. He is comparing two runners, one fat adapted and one not. He shows how the fat-adapted guy succeeds because his glucose lasts longer.
Fat Burning Essentials by Alan Couzens
Quote:
... if the race is longer than 2hrs it is generally the athlete who spares the most carbohydrate (by burning the most fat) who wins out.
Additionally, for those athletes with fat loss goals (i.e. all of us!!) the amount of fat that we burn in any one session or one day of training is greatly affected by how good we are at burning fat. In the course of our lab testing we have seen a wide range of fat burning abilities at ‘normal’ easy-steady training intensities, anything from 2kcal/min to 10kcal/min. Or, put in other terms to lose 1lb of fat for our carb burner would require 29hrs of aerobic training, whereas for our lean, mean fat-burning machine, it would take less than 6. ‘Nuff said!!!
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Also Mark Sisson on What does it mean to be fat adapted
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