I am about three weeks into my paleo diet and I'm pleased with my results. I chose the diet not to lose weight, but rather, to improve my general health and fitness. I am an athlete of sorts. I train BJJ three times a week and generally do three kettlebell based strength/cardio workouts per week.
My question is; does a strict Paleo diet always lead to ketosis? Although I occasionally go ketonic, my high fruit consumption usually keeps me out. Is ketosis beneficial?
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Strict Paleo doesn't lead to ketosis. An intake of 60g of carbs or more in the course of a day will keep you from entering ketosis. I'm pretty sure your fruit consumption is keeping you out of ketosis.
I've seen studies that show that ketosis does not affect endurance-based exercise (biking/running), although personal experience tells me it affects strength based exercise to some extent. For me, when I'm in keto, I find that I can lift fairly heavy, but I can't do it for more than 3-5 reps, whereas when I am eating 100-150g carbs a day I can do over 5 reps.
Ketosis is not a dangerous state to be in, it's perfectly fine. You might want to eat some carbs once in a while, just to break up long periods of keto, since I've read that Dr. Atkins mention long periods of keto causing decreased thyroid hormone, although I'm not sure how long "long" is.
Ketosis is not dangerous and for many people can be beneficial. Paleo is not necessarily ketogenic - only low carb/moderate protein is. Most paleo-athletes eat enough starch (and/or fruit) to only be in ketosis either while fasting or overnight. Being in heavy ketosis 24/7 may have some downsides, but there is debate about that as well. The only reasons to seek out deep ketosis would be: a need to lose a lot of fat or reverse metabolic syndrome - or as a medicakl treatment of a number of brain-related problems (epilepsy, ADHD, Alzheimer's, Parkinson's, depression, bi-polar disorder, etc.)
Strict Paleo does not always lead to ketosis. No, it's not dangerous for most people.
To answer your question IMO yes, I believe it is. I train 6 days a week in martial arts and 2 heavy weight training sessions per week. I am trying to get to the bottom of ketosis as well and understand the process of gluconeogenesis. Is it dangerous to be in ketosis for extended periods? If yes, how long is considered dangerous? There seem to be varying answers.