Very loosly:

VLC = Ketosis = under 50g of carb/day (for most people)

LC = Under 150g/carb a day by most definitions but maybe under 100g/day for many.

You do assume correct in that your activity level can largely dictate whether your diet is "low carb" or not for you. However I seriously doubt that most people burn as much carbohydrate as they think during a workout session. If you are working out with any real intensity then your sessions should be quite a bit under an hour....at that rate you would be hard pressed to burn through more than a 50-100g of glycogen.

Hmm... From my understand people go into ketosis like in the morning after breaking an initial fast from sleeping, but your body isn't really efficient at using these ketones efficiently. I don't think the ratios really work out that way being 6'2" and 220 lbs of solid muscle or 5'7" 140 lbs of muscle. You are assuming that ALL carbohydrate intakes are either spent for fuel or store/restores as muscle glycogen. You see you may be able to "burn up all the carbs" but you can't burn the "insulin" you produced to rebalanced your blood sugar. Plus are you sure all the "glucose" was spent during your workout or to restore muscle glycogen? How about how much of that were turned into triglycerides?

Initially when you go into ketosis your body is very inefficient using ketone bodies to shuttle around energy, so it just makes a tone of ketones, and then you piss them out sweat them out and even comes out of your breath, so yeah the ketostix become purple if you were to stay in ketosis for say 3-6 weeks your body becomes "keto-adapted" where then you are efficiently using ketones as energy and there is no more waste, so next time piss on a ketostix you are not turning purple, but still in ketosis.

I have gone down the bodybuilding path, and I understand the mentality, it seems to all stem from the food pyramid of death, heck back in the 50's or so they used to advertise sugar as a good thing for instant energy. Glucose is an anaerobic fuel and only your red blood cells really need it. I don't understand why your body would prefer a cheap fuel source like glucose over a stable long lasting fuel source that doesn't cause sugar spikes (and the side effects from sugar spikes, i.e. sugar crash/moods/headache) Glucose is glycating, it can bond with a lipid or protein and make it malfunction in the body. Then there are Advance Glycation End Products (AGEs) I think our bodies wouldn't mind if you never had a carb again. We can produce what we "need" through gluconeogenesis. Ketones are said to be preferred energy for the brain and other organs, the heart prefers stearic acid. Leptin the master hormone, master of even insulin, which lets you know if your hungry or not is a fat sensor, not a glucose sensor. Insulin primary purpose is not to "lower sugar" but it has taken that role. I believe that hormone was actually a hormone that came into play during famines where it would control the utilization and storage of fat (or something like that?)

Well I am sure people will disagree with me but if you asked me "Would you rather be a sugar burner or a fat burner?" my response would be "Do you really have to ask?" Fat burner! lol One benefit being ketogenic is I am not a "Slave" to food having to eat every couple hours, I can eat twice a day a nice fatty nutrition dense meal and not lose any "lean tissue" There are no studies that say that eating every two hours over eating twice a day burn more or less calories. Though I think where they got that idea was because the thermogenic effect of food. So lets say you fasted one day, your metabolism appears to be lower but your BMR stays the same, had say you have eaten that day the thermogenic effect of food "increases" your metabolism, but your BMR is still the same, you just burned a few extra calories in digestion of the food. whoopie....

Personally I rather be either in ketosis or not at all, because I think when you are in limbo of right before ketosis but not quite I always felt like crap, because there isn't quite enough carbohydrates, not enough ketones for energy

but it all boils down to you, what works for you? Maybe we will never know but cavemen seem to manage to live of fat/protein, unless Julia Child was there baking cakes in the caves. :)

Check out this book: The Art and Science of Low Carbohydrate Performance

I hope that was somewhat coherent lol

http://paleohacks.com/questions/30408/definitions-quantities-zc-vlc-low-carb-moderate-carb#axzz26ejpvOKY

I don't think that VLC vs LC varies by person because they are about magnitude, not metabolic effects.

Ketogenic is a ratio thing. In the typical ketogenic diet, 80% of your calories come from fat. For epilepsy they have a specific ratio: http://www.bodyrecomposition.com/wp-content/uploads/2009/07/kr.jpg

Ketosis however is a highly personal thing which occurs when you body starts to generate ketones for energy.

LC at 150 carbs is sort of . . . iffy. That's the level Sisson puts out in his chart for basic maintenance of body weight and to prevent adding fat back to your body, but the reality requires a bit of testing on an individual basis. If you run 5 miles every day and hit the gym, your body will have quite a different reaction to 150 carbs than it would if you just sat at your desk all day.

That said, part of the analysis obviously does depend on your size and total caloric intake for the day (i.e., a percentage). I'm 6' tall, weigh 235 lbs., eat on the the order of 4,000 calories per day, and am fairly active, so 150 carbs is a fairly insignificant portion of my caloric intake, yet I still find that I do better on relatively lower carbs, and really feel better if I eat mostly meat and eggs with the occasional Cobb salad and veggie thrown in. Something on the order of 20 carbs a day makes me feel happy, and keeps my body happy, and generally keeps me in ketosis, which my brain appreciates.

Once in a while I'll pull a Lyle McDonald and have a "carb up" day to reset leptin, but even with all the science regarding LC, insulin, and improvement of biomarkers, we still have to realize that our individual experiences may differ greatly from everyone's else's. We are a one-subject experiment.

VLC and LC are relative terms.

You would have to test your blood BOHB levels to determine your level of ketosis accurately.

It's generally recommended to keep your carb intake under 50g a day to remain in ketosis.