>
> If you remember a source url for the 100g maximum protein/day I  
> would appreciate it.
>
> William
>

1) Please see this excerpt from Phinney's review "Ketogenic Diets and  
Physical Performance":

"The third dietary factor potentially affecting physical performance  
is adjusting protein intake to bring it within the optimum  
therapeutic window for human metabolism. The studies noted herein  
[13-15,20] demonstrate effective preservation of lean body mass and  
physical performance when protein is in the range of 1.2 – 1.7 g/kg  
reference body weight daily, provided in the context of adequate  
minerals. Picking the mid-range value of 1.5 g/kg-d, for adults with  
reference weights ranging from 60–80 kg, this translates into total  
daily protein intakes 90 to 120 g/d. This number is also consistent  
with the protein intake reported in the Bellevue study [9]. When  
expressed in the context of total daily energy expenditures of 2000– 
3000 kcal/d, about 15% of ones daily energy expenditure (or intake if  
the diet is eucaloric) needs to be provided as protein.

The effects of reducing daily protein intake to below 1.2 g/kg  
reference weight during a ketogenic diet include progressive loss of  
functional lean tissue and thus loss of physical performance, as  
demonstrated by Davis et al [21]. In this study, subjects given  
protein at 1.1 g/kg-d experienced a significant reduction in VO2max  
over a 3 month period on a ketogenic diet, whereas subjects given 1.5  
g/kg-d maintained VO2max.

At the other end of the spectrum, higher protein intakes have the  
potential for negative side-effects if intake of this nutrient  
exceeds 25% of daily energy expenditure. One concern with higher  
levels of protein intake is the suppression of ketogenesis relative  
to an equi-caloric amount of fat (assuming that ketones are a  
beneficial adaptation to whole body fuel homeostasis). In addition,  
Stefansson describes a malady known by the Inuit as rabbit malaise  
[8]. This problem would occur in the early spring when very lean  
rabbits were the only available game, when people might be tempted to  
eat too much protein in the absence of an alternative source of  
dietary fat. The symptoms were reported to occur within a week, and  
included headache and lassitude. Such symptoms are not uncommon among  
people who casually undertake a 'low carbohydrate, high protein' diet."


2) Also, Ron Rosedale in his book recommending a "high fat, low  
nonfiber carbohydrate, moderate protein diet," has charts that start  
on page 207 to help you figure out daily protein requirements.   
Basically, for those who are not overweight, the number is half your  
weight.  There are a few more calculations involved for the  
overweight -- but the gist is the same as Phinney above.

Here's a quote from the book:

"The fact that protein is essential for life... doesn't mean that you  
can eat it in unlimited quantities.  When you eat more protein than  
your body needs to replace and repair body parts, excess protein is  
largely converted  into glucose and burned as fuel.  It turns you  
into a sugar maker and sugar burner!  This is not desirable or healthy."

Jim Swayze
www.fireholecanyon.com