Question is as posted. Years ago messing around with a very high protein/low carb/low cal (PSMF) diet I would get woozy after workouts and squirt about a tablespoon of honey in my mouth post-workout to "clear my head". This did not affect my ketosis, but argueably a small tablespoon of sugar over the course of a day where meals are protein powders and chicken/tuna wouldn't really be enough to kick a person out of ketosis.
However, I would like to have some understanding to see if an individual, properly fat-acclaimated (as I am, I get tons of energy eating fats currently) and in ketosis, would have any problems downing some sweet potatoes post-workout.
I know currently if I have a "meat and potato" meal, my next day tends to result in a carb flu, but I've yet to experiment post workout.
Tough to answer since ketosis has different definitions according to different people. I would say in the final analysis that doing a 200-300 grams of carb-refeed PWO will NOT:
On the contrary I think you will feel wonderful after a big whack of carbs PWO. I know I always do. I am generally LC to VLC on nonlifting days and then PWO (and nowadays even PreWO) i am getting something like 300-400 grams of starchy carbs from sweet potatoes and squashes and even white rice.
Cyclical Ketogenic Diets(CKD) along the lines of what Lyle McDonald gets behind relies on being in ketosis with targeted carb reloads at targeted times once or twice a week, usually post workout. He's written extensively about it at www.bodyrecomposition.com
I've recently have started the leangains fasting approach where I go VLC the majority of the time and do moderate carb refeeds PWO on two of my workout days(100-200g starchy carbs) and then go all out with a massive PWO refeed on the third workout day(300g). ON all other days I am at 50g or less a day and slightly underfed. Seems to be working well as far as a mechanism for dropping fat rapidly.
I agree that Lyle McDonald has the best information on this. Besides the CKD, also see the TKD -- Targeted Ketogenic Diet. In this protocol you take pure glucose before a workout. By the time you are finished, you will likely be back in ketosis. That's what happened to me when I did it.
You can test it with Ketostix if you want to be sure. In fact, you can play around with all sorts of variations, and find out how long it takes to get back in ketosis.