Why does a normal 6 oz. can of albacore tuna say it contains approximately 2.5 servings of drained tuna @ 2 oz. PER SERVING? In other words, the can says it yields 5 oz. of tuna (2.5 servings x 2 oz.) once it's drained.
Why the macros on the can are completely wrong:
1. Weight of entire, unopened can of tuna = 7 1/8 oz.
2. Weight of entire empty can (just the bottom and lid) = 1 1/8 oz.
So right there, that leaves us with 6 oz. of tuna AND water combined.
Well, then we have to DRAIN the water from the tuna, and I can tell you right now, that there's A LOT MORE than just 1 oz. of water in a can of tuna.
I've had 4 cans of tuna over the last 2 days (Chicken of the Sea Albacore & Bumble Bee Albacore) and the weight of each completely drained can has been the following:
Can #1 - 3 1/2 oz.
Can #2 - 3 1/8 oz.
Can #3 - 3 1/8 oz.
Can #4 - 3 1/4 oz.
Yes, I drain my tuna thoroughly, but I don't use any special devices, I simply press the lid down on it firmly until all the water is gone and then weigh it on a digital scale. As you can see, my average can of tuna has yielded NOWHERE CLOSE to 5 oz. of solid tuna, like the can says it does.
So, using 3 1/4 oz. as the average weight of my last 4 cans, these are the macros we're looking at:
1 can of drained tuna (approx. 3 1/4 oz. OR 1.625 servings @ 2 oz. per serving):
114 Calories: 1.6g F, 0g C, 24.4g P
But if you were to simply go off the can, you'd think your macros were:
175 Calories: 2.5g F, 0g C, 37.5g P
The point here isn't so much about the difference in calories, but overstating your protein consumption. The can makes you think you're getting about 38g of protein in each can, when in reality, you're only getting about 24g. If you're watching your macros carefully, this is important, as it adds up quickly over the course of time, especially if you eat a lot of tuna.
Has anyone else noticed this?
02-29-2008, 12:53 PM #1
A regular 6 oz. can of tuna ONLY YIELDS approx. 3 oz. of drained tuna!!!Be humble or be humbled.
02-29-2008, 12:56 PM #2
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02-29-2008, 12:57 PM #3
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I came to the same conclusion a while ago--ended up just going by the can. Why? Well, you have to realized 2oz drained from person A may contain more water then person B. I'm assuming their draining methods don't fully drain the tuna like most consumers. If it says it's 2.5 servings I usually just enter it as 2.
02-29-2008, 01:00 PM #4
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The fact that you would even THINK about doing this worries me. Seriously.
If you really want to get anal, there are various factors that could create error. There is a difference between your scale and the scale the company used. There is a difference between how much water you drained out and the water the company drained out, etc.
It's not that serious.On the individual:
His responses grow intelligent, or gain meaning, simply because he lives and acts in a medium of accepted meanings and values. Through social intercourse, through sharing in the activities embodying beliefs, he gradually acquires a mind of his own. The conception of mind as a purely isolated possession of the self is at the very antipodes of the truth.
- John Dewey
All are lunatics, but he who can analyze his delusion is called a philosopher.
02-29-2008, 01:04 PM #5
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02-29-2008, 01:18 PM #6Be humble or be humbled.
02-29-2008, 01:27 PM #7
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I've never weighed my tuna, but I have noticed the calorie/protein difference between different brands of tuna, all of which come in 6 oz. cans, and I've noticed that fitday.com gives a different number than the labels. I've been quite frustrated trying to figure out how many calories are actually in those things, so yeah, I feel your pain.
02-29-2008, 01:34 PM #8Be humble or be humbled.
02-08-2012, 09:21 AM #9