Josh, the problem with a general % prescription is that it doesn't take into account how many calories you are eating.
For example, someone like myself eats around 5,000 per day. If I were to follow the 40-40-40% prescription, I would be eating over 500grams of protein per day...this might even be seen as excessive with muscle and fitness subscribers. Most everything that's out there tells us that the MAX protein intake recommended is 2 grams/kg or around .9 grams / pound. %'s need to change based on how many calories you are taking and and how much you weigh etc. BTW, I weigh around 240 which puts my high-end protein intake at around 219 grams / day (which comes out to around 18% of my total calories). With an average fat intake of around 100gr. per day, my diet looks something like this:
Protein: 18%
Fat: 18%
CHO: 64%
These days this would be considered a high-carb, low-fat diet right? But when you take into account the sheer amount of protein and fat in my diet, this would be an incorrect statement.
BTW, If I'm going to eat excess calories, I not going to intake more protein, that's for sure.
If we go a step further, we really should be doing the formulas for lean body mass so if you have higher bodyfat %'s, the number you get is probably too high anyway.
__________________
Robert dos Remedios, MA, CSCS,
HCC (Hartman-Cosgrove Certified)
Director of Speed, Strength & Conditioning
College of the Canyons, CA
http://www.canyons.edu/departments/pe/strength
"NO CHAMPION HAS EVER ACHIEVED HIS OR HER GOAL WITHOUT SHOWING MORE DEDICATION THAN THE NEXT PERSON; MAKING MORE SACRIFICES THAN THE NEXT PERSON; WORKING HARDER, TRAINING, AND CONDITIONING HIM / HERSELF MORE THAN THE NEXT PERSON; ENJOYING HIS / HER FINAL GOAL MORE THAN THE NEXT PERSON" -Doak Walker-
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