Your question is impossible to answer without more information. I will do my best to answer it anyway, and hopefully provide enough information for you to figure this out.
First and foremost, your body will convert protein to glucose only to the extent to which it is needed or deemed metabolically efficient. It takes a lot of energy to do the conversion so the body won’t do it “just for fun.” That means that if you are doing more strenuous activity, thinking harder (brain loves glucose), or are under stress (remember cortisol and the catecholamines?) you will convert more protein into glucose than under more ‘ideal’ situations. Also remember from PB that the body first uses ingested proteins for structural and repair purposes. So if your body needs 50g to repair and build structures, and you eat 50g, you will have (albeit too simple) 0g conversion. If you eat 100g then your body might use 50g to make glucose, if it’s needed. (That is an oversimplification, but I’m sure you get the point that your general question is insufficient to beget a specific answer). Note: your body won’t build your muscles at the expense of feeding your brain, so if you dip too low in protein ingestion to cover your structural needs AND providing fuel for the brain, guess what: your body will eat your muscles.
Ok, so that covers the “all protein” part of your question. No, not all protein is converted to glucose when in ketosis. If that were the case, ketosis would not be muscle-sparing, as it is. It also touches upon the “only excess protein gets converted” portion of you question because, as stated above, gluconeogensis is costly to the body, and your body won’t do it if it doesn’t provide a metabolic advantage. If you are fully converted to ketosis, at which point your brain has switched over to using ketones for the majority of its energy needs, then your liver won’t both converting the excess protein to glucose. The excess protein will just be metabolized as is. However, if you are in the beginning stages of ketosis and your brain relies heavily upon glucose yet, then the liver will convert more. So in short: it depends on what your body needs at the time as to how much of your excess protein is converted into glucose.
Now for the last option: 58%. Where did you get this number? The only place I’ve found it was in reference to Lyle McDonald, and it was mentioned along with his 10% carb conversion. If that is the case, then I’m going to assume that you read it wrong. The 10% carb conversion (to fat) doesn’t mean that 10% of ingested carbs are converted, rather that once your fat intake dips below 10% of total daily calories, your body will convert ingested carbs into fat, otherwise, it’ll just burn/store the excess carbs at the expense of burning fat (http://www.bodyrecomposition.com/fat...e-get-fat.html
). If this is a similar reference as your 58% protein conversion, then it simply refers to what percentage of the diet needs to come from carbs (58%) in order to prevent gluconeogenesis, but it does NOT discuss how much of ingested protein is converted to glucose. However, this analysis is purely speculation based upon what I could assume of the source of your 58% ratio.
As for ketosis overall, here’s a quote from Lyle:
“Journals are old and out of date and wrong.
keto ratios only matter for epileptic children and will end up shorting you on protein if you use them.
How to set up a keto diet
a. set calories: 10-12 cal/lb
b. set protein: 0.9-1 g/lb LBM. *4 to determine calories from protein
c. set carbs: figure on 10 g/day minimum * 4 to determins cals from carbs. If you're doing a TKD, this value will be higher (50 g/day or what have you).
d. figure fat by differences in a and 'b+c'. Subtract cals from protein and carbs from total cals to get cals from fat. Divide by 9 to get grams.
180 lb male, 10% bodyfat, 18 lbs fat, 152 lbs LBM.
1. 180 X 10 = 1800 cal/day
2. 152 * 1 = 152 g protein * 4 cal/g = 600 cal
3. 10 g carbs * 4 cal/gram = 40 cal
4. 1800 cal - 600 cal - 40 cal = 1160 cal from fat / 9 cal/g = 128 g fat.
Daily diet =
152 g protein
10 g carbs
128 g fat
If you eat more calories (12 cal/lb), raise fat intake (total cals go to 2160, fat goes to 168 g/day). If you have to cut claories further, reduce fat. Protein should never change.
Basically, you set calories, protein should never change and fat and carbs are used as the caloric ballast to get total cals high enough.
I would also like to recommend that you check out some of his books (The Protein Book, The Ketogenic Diet, etc.) as well as his website http://www.bodyrecomposition.com/
for a log of articles to sift through.
Ok, so now that I fell like I’ve babbled way too much to be coherent to anyone, let me sum all this up: who knows how much your body converts based upon the data you’ve given us. Basically, it converts as much as it needs. Increase its needs and it increases its conversion. Decrease its needs and, well, you get the idea.