I signed up specifically so I could answer this question.
The short answer is that I would wait until after your race to try it. Based on my personal experience and research, many people experience a "low-carb" or "Atkins" flu when transitioning to a low-carb diet. Even having been semi-primal over the course of about two years, I had a rough week during my recent transition; probably the result of never having been carb-free long enough to trigger it.
I want to try and share my personal experience in making the transition:
A little background: I have been half-assed primal for probably around two years now; meaning that while I subscribed to the ideas and actively cut back on carb and sugar intake, I never really got it down with any consistency. At some point I got mad enough with myself over my spastic low-carb/hardgain/starvation/carb binge diet to commit to pursuing a primal diet.
To give you an idea of my activity level, I work a desk job, but do some bodyweight training most days. In addition I cycle about 10 minutes to work (sprint over hilly terrain, not a leisurely ride) when weather permits, and I also do two hours of karate two nights a week. I am 6'0 and weigh 150 lbs.
Tuesday May 10: Birthday. Meal out w/ family, massive carb binge (3 pcs birthday cake). :P
Wed: Start of primal eating.
Thu: Feeling good. Bike commute. Karate.
Fri: Feeling good. Bike commute.
Sat: Feeling good.
Sun: Feeling good. High-intensity intervals.
Mon: Bike commute. Noticed legs feeling weak about halfway through the day. Struggled home on the bike. I felt slightly better after a bit and struggled my way through karate.
Tue: Bike commute. Got up feeling good. Ran out of gas halfway up the stairs to the office. By this I mean I actually had to take breaks between flights of stairs. By mid-afternoon standing up from my chair was a battle. Brutal ride home.
Wed: Drove to work. Felt as though I had no energy in my legs, no noticeable improvement from previous day.
Thu: Drove to work. After lunch (salad) I got up and suddenly found there was a marked improvement in my energy levels, further gradual improvement over the course of the afternoon. Went to karate but really struggled the last half hour.
Fri: Drove to work. Moderately tired.
Sat: Residual tiredness.
Sun: Normal energy levels.
So to recap that was severe low-carb flu for three days, symptoms persisting for a further three days. That being said, the duration and timing of low-carb flu apparently varies on a case-by-case basis; some people are quoting two weeks to a month, so maybe I got off light!
One of the things I found most interesting about the whole experience is that the weakness was more or less limited to my legs. I was struggling to get out of chairs, but at the same time, during the whole ordeal I never had any issues with upper body movements (pushups, crunches, etc). Obviously I did some reading to see if anyone else experienced anything similar, and while people mentioned weak legs nobody really commented on the state of their upper body in comparison. Weird.
I also found that I ate like crazy during my low days, almost to the point of being sick. I think I ate a one-pound bag of almonds in three days, which is almost 3000 calories worth of almonds alone. The entire time I felt really guilty about how much I was eating, but I think in many ways it saved me as I was largely too full to risk falling back on carbs.



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