Carb Diet Ranges

lithezebra wrote: »

You can get all the energy that you need for working out from fats. The glycogen levels of people in ketosis are normal. They're just better at using fat, because their enzymes for fatty acid catabolism are up-regulated.

Are they? Never heard that before - does it also apply when someone is losing weight?
I ask as the endurance athletes I've heard of do fuel their events with carefully controlled carb intake.

But I guess it depends what the OP means by "workout" - that could vary from 250 - 2000 cals for me so dosage would be very different.

sijomial wrote: »

lithezebra wrote: »

You can get all the energy that you need for working out from fats. The glycogen levels of people in ketosis are normal. They're just better at using fat, because their enzymes for fatty acid catabolism are up-regulated.

Are they? Never heard that before - does it also apply when someone is losing weight?
I ask as the endurance athletes I've heard of do fuel their events with carefully controlled carb intake.

But I guess it depends what the OP means by "workout" - that could vary from 250 - 2000 cals for me so dosage would be very different.

There is a book called Primal Endurance that talks about the science and how and why it works. Great read.

There are more and more athletes that are switching to low carb. Once your body is "fat adapted", in that it can burn your fats for fuel, you will never run out of calories. Just think about it, at 3,500 calories/lb of fat a very lean (5% body fat) person will be 7.5 lbs of fat on their body with a caloric value of over 26,000 calories.

This is the most extreme case. Almost everyone has more fat than that on them and will not want to go below 5% body fat... but you get the idea.

Just imagine having 26,000 calories available to use... you no longer risk bonking. At least not from running out of glycogen.

Vowder wrote: »

sijomial wrote: »

lithezebra wrote: »

You can get all the energy that you need for working out from fats. The glycogen levels of people in ketosis are normal. They're just better at using fat, because their enzymes for fatty acid catabolism are up-regulated.

Are they? Never heard that before - does it also apply when someone is losing weight?
I ask as the endurance athletes I've heard of do fuel their events with carefully controlled carb intake.

But I guess it depends what the OP means by "workout" - that could vary from 250 - 2000 cals for me so dosage would be very different.

There is a book called Primal Endurance that talks about the science and how and why it works. Great read.

There are more and more athletes that are switching to low carb. Once your body is "fat adapted", in that it can burn your fats for fuel, you will never run out of calories. Just think about it, at 3,500 calories/lb of fat a very lean (5% body fat) person will be 7.5 lbs of fat on their body with a caloric value of over 26,000 calories.

This is the most extreme case. Almost everyone has more fat than that on them and will not want to go below 5% body fat... but you get the idea.

Just imagine having 26,000 calories available to use... you no longer risk bonking. At least not from running out of glycogen.

Only if your exercise is low intensity.

I'm quite well fat burning adapted (through my exercise rather than through my diet) but my exercise is at an intensity that just using fat as the majority fuel isn't enough.

Even on long events my intensity means that fat isn't even meeting half my energy requirements.

nvmomketo wrote: »

No need to increase carbs on higher activity days unless you want your body to still rely on glucose for fuel. Not actually needed.

sijomial wrote: »

Vowder wrote: »

sijomial wrote: »

lithezebra wrote: »

You can get all the energy that you need for working out from fats. The glycogen levels of people in ketosis are normal. They're just better at using fat, because their enzymes for fatty acid catabolism are up-regulated.

Are they? Never heard that before - does it also apply when someone is losing weight?
I ask as the endurance athletes I've heard of do fuel their events with carefully controlled carb intake.

But I guess it depends what the OP means by "workout" - that could vary from 250 - 2000 cals for me so dosage would be very different.

There is a book called Primal Endurance that talks about the science and how and why it works. Great read.

There are more and more athletes that are switching to low carb. Once your body is "fat adapted", in that it can burn your fats for fuel, you will never run out of calories. Just think about it, at 3,500 calories/lb of fat a very lean (5% body fat) person will be 7.5 lbs of fat on their body with a caloric value of over 26,000 calories.

This is the most extreme case. Almost everyone has more fat than that on them and will not want to go below 5% body fat... but you get the idea.

Just imagine having 26,000 calories available to use... you no longer risk bonking. At least not from running out of glycogen.

Only if your exercise is low intensity.

I'm quite well fat burning adapted (through my exercise rather than through my diet) but my exercise is at an intensity that just using fat as the majority fuel isn't enough.

Even on long events my intensity means that fat isn't even meeting half my energy requirements.

Those who are fat adapted (in ketosis for a few months) have an amazing ability to use fat for fuel. The fat oxidation levels are much higher than was previously expected. Two to three times higher. For them, fat is enough.
http://www.sciencedirect.com/science/article/pii/S0026049515003340

Thanks for that, as a long distance cyclist fuelling is a subject close to my heart!
The higher levels of fat oxidation aren't surprising of course but doing it at the higher than usual VO2 max levels is interesting.