Everyone is different, of course, but i wonder if it's dependant on what your body is used to (or has grown accustomed to)?
I am on a fairly strict Paleo diet (since Aug 08) - almost no carbs (less than 10/day), and high fat and I have so much energy I can't sit still. I am self employed and i have trouble sitting in front of my computer for more than a few minutes and working!
I walk 3-5 days a week and do strength training daily, I have 5 children under the age of 8, plus I farm livestock, so I'm pretty steadily active during the day. I haven't encountered any tiredness - but then again, I'm not doing athletics like a lot of you.
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