I see this is a really old thread, but I'd just like to add my own experience.

One month ago I went on a low carb, high fat diet primarily for weight loss, but my narcolepsy sleep attacks are almost gone: normal was 2-3 times a day, now it's down to maybe 2-3 a week.

I don't know how my genes are, but something in this diet (or lack of it) is helping. My diet is very much like Atkins induction, but I stay away from all sweeteners (natural and artificial) as much as I can. Lots of fats and a fair amount of green vegetables. No flour of any kind.

I'm particulary sensitive to flour, which seem to cause sleep attacks. And falling asleep in resturants is kinda awkward. My previous diet would be considered a normal, healthy one, btw.

I still suffer from the same cataplexy attacks, although they seem to be a tad bit weaker, frequency and triggers are the same.

My 2 cents! Best regards