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While a full day's canoeing might not average out at the same cardio level as heavy portaging or marathoning, it's still (for me) elevated-heart-rate exercise, and you can't fuel that on fats alone.

Bull.  I've done it.


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The amino acids get stored in body fat as triglycerides (fat molecules), which are broken down and re-released into the blood as needed.

Technically true, but elevated insulin levels interfere with this process.  If this was true for all people all the time there would be very few overweight people in the world.  People don't overeat becasue they lack willpower or self-contorl, they overeat because their body is screaming for nourishment at the cellular level and their insulin levels are blocking them from getting what they need.

I think where I part ways with your author is that I have allowed my body to adjust to burning primarily fat for energy.  Everything he's saying is true for the period where your body is adjusting to the change in fuel.  But once your body has switched over to fat-burning, you'll actually feel MORE energetic throughout the day.  I know I do.

Bottom line though is everyone's body and tolerance for carbs is different.  And yes, the more you exercise, the more tolerant you will be of carbs regardless of where you fall on the tolerance scale.  And if you are going to eat carbs...and if you're body tolerates them OK I don't know why you wouldn't...it's best to eat natural foods with plenty of fiber and whole grains.  Lower on the glycemic index is better.

If you can tolerate carbs, more power to you.  Those who can't would benefit from researching the low-carb lifestyle.