Isnt 100 g of tuna fish in a can 100g of pure protein?

[pippo]

I mean, lets assume theres no fat/oils/starches in the can. Isnt a 6 oz can of tuna 6 ozs of "protein, for practical considerations? Some doctor here is telling the wife its not true- that all shes getting is a fraction of that in "real" protein........

[Phi for All]

I think that in dietary terms, if someone is eating 6oz of fish, it's considered a serving of protein. In technical terms, by the Nutrition Facts label, only a quarter of the serving is considered actual protein, at least in the case of tuna fish.

[John Cuthber]

"Isn't 100 g of tuna fish in a can 100g of pure protein?"

No.

There's a lot of water there (my guess is about 70%) as well as other things like salt, fat, whatever it is that makes it pink, etc.

So, 100 grams of tuna is probably about 30 grams of protein.

[EdEarl]

No need to guess, read the label.

 

I found one online. For tuna in water, it says.

Serving size 154g

Protein 39g

 

The way I read it, you buy about 114g water, 39g tuna, and a little salt.

Edited June 26, 2013 by EdEarl

[John Cuthber]

No need to guess, read the label.

 

I found one online. For tuna in water, it says.

Serving size 154g

Protein 39g

 

The way I read it, you buy about 114g water, 39g tuna, and a little salt.

No, tuna isn't just protein.

Tuna is mainly water so, you don't get 39 grams of tuna, you get 154 grams of tuna which includes about 39 grams of protein and probably something like 100 grams of water.

Fish are mainly water (gosh!) rather than mainly protein.

Proteins are solids so if the tuna was 100% protein it would be like a plastic cast of a fish. The protein would be like resin- about as stiff as the stuff your fingernails are made of. It wouldn't be able to swim, it's heart wouldn't beat and it wouldn't have any brain or nervous system function.

[ewmon]

Canned tuna is mostly muscle cells, and any cell is mostly water. I'm pretty sure that the "water" being discussed here is not the water that people drain from a can of tuna. Instead, it's the water within the cells ... think of it as "biological" water" necessary for biological processes to occur. I have extracted proteins from foods, and it can take many forms, but it certainly wouldn't look like the pieces of tuna that we see in a tuna can. Think Soylent Green.

[pippo]

LOL!! Funny posts- nothing wrong with injecting a little humor in this subject, I say! Good points, fellow members. Geez- I shoulda remembered animals are mostly water (Bio 101, I even got an A in it). I get it now. 100g of tuna in a can, get the consumer only a fraction of true protein, when weighed up.

 

Thanks, people, for the continued advice/help!!!!! Keeps me coming back! (time to eat "crow", instead of tune, with the wife- she was right.....sheesh)

[mistbooster]

"Isn't 100 g of tuna fish in a can 100g of pure protein?"

No.

There's a lot of water there (my guess is about 70%) as well as other things like salt, fat, whatever it is that makes it pink, etc.

So, 100 grams of tuna is probably about 30 grams of protein.

 

I am guessing you are mixing salmon to tuna here, Canned salmon often is uncooked, while tuna in most cases is cooked, turning it to greyish color. and the actual protein content is between 20 and 22% on most cooked tuna products in a can. the rest is either oil or water, salt, and other stuff(the fats of the fish etc.)

[John Cuthber]

 

I am guessing you are mixing salmon to tuna here, Canned salmon often is uncooked, while tuna in most cases is cooked, turning it to greyish color. and the actual protein content is between 20 and 22% on most cooked tuna products in a can. the rest is either oil or water, salt, and other stuff(the fats of the fish etc.)

That's just silly for two reasons. Firstly, all (essentially) tinned food is cooked- otherwise it goes off in the tin.

Secondly, there's no reason to think anyone is talking about salmon.