On the can it should specify whether or not a serving is with water, or drained. If a serving is 2oz, drained, then measure that. If a serving is 2oz of tuna including water, make sure when you measure it on the scale that you do so without draining. Hope this helped.
Am I the only one who is conflicted on just how many servings are in a can of tuna? I eat tuna canned in water, and it says it's 5 oz (with water, of course). I drain it and weigh it on a scale, and it usually comes out to about 2 ounces, give or take a little. Yet, the can insists it has about 2 servings, with 2 oz. being the serving size.
Is an entire can of tuna, drained, a serving, or not? My scale says it is, but the nutrition facts state otherwise.
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