actually compash that isnt correct.
when an item says that it is 40% protein it means that 40% of the weight of it is protein.
for instance - [color=red]pumpkin seeds are 25% protein and about 50% fat. they have around 600cal per 100g, with 100cal coming from protein. this doesnt however mean they are 16.8% protein.[/color]
yes, Jonathan, that DOES
mean they are roughly 17% protein. So I have no idea where you are getting the figures above in red. Pumpkin seeds are approximately 17% protein and 76% fat
. SO for a 600 calorie serving of pumpkin seeds, approximately 102 of those calories come from protein (as you indicated), which, in grams, works out to roughly 25 grams. The calories from fat are approximately 456 (i.e. 76% x 600= 456). In grams, that works out to about 51 grams of fat.
But wait a second Jonathan, I just realized that we are talking about two different things. The weight of the package is not the same thing as a food's macronutrient constitution. I am talking about the latter and you the former.
I think we are both right because we are talking about different things. But do you see how I am arriving at the numbers? It is factually accurate to say that 17% of a pumpkin seed's calories
come from protein. It is also factually accurate to say that if an item is 100 grams, and 25% of those grams is proten, then 25 grams is the amount of prorein. You get to the same number. Of course, if you are trying to figure out the macronutrient constitution of an item, and it doesnt have the percentage of the weight of the protein, then your method cant be helpful. You'd have to take the more complicated route (i.e. my way).
if an item like your pumpkin seeds above is 100 grams per serving, and the package says 25% of those grams (i.e. the weight) is protein, then yes, 25 grams of it is from protein (a number we both arrived at, but differently).
It would be so much easier if we could talk this one through face to face . I bet we could resolve it in two minutes.