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Originally Posted by WereBear
And lower bioavailability. I think Diet Doctor had an article advising people they need to eat 30% more of plant protein sources to get the same amount of protein as animal sources.
Since they don't tell us the percentages, we don't know what the actual protein is in that carton. Except that it is less than what is on the label.
Which got me thinking about fast food. Maybe on paper they offer nutrition, but we don't know the percentages of each ingredient. A lot of finagling can go on under the ingredient order, I'm thinking.
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This is true of all foods that have a label with a list of ingredients.
Flour has a small amount of protein in it, same with green vegetables, potatoes, and of course all kinds of beans - well pretty much all plant origin ingredients have at least a tiny amount of protein, even fruit.
About the only plant origin ingredients that don't contain proteins are oils.
The nutrition label accounts for all the tiny bits of protein from all the plant origin ingredients, without separating them from the animal origin protein.
About the only thing that gives you a clue as to how much of the protein in one of those Boost drinks is from dairy and how much is from soy would be the order of those ingredients on the label, since ingredients need to be listed in order by weight, which gives some idea of how much of the protein is from milk, and how much is from soy.
You can look up the ingredient lists from different types of Boost - here's the list from Chocolate Boost Plus:
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WATER, GLUCOSE SYRUP, SUGAR, VEGETABLE OIL (CANOLA, HIGH OLEIC SUNFLOWER, CORN), MILK PROTEIN CONCENTRATE, AND LESS THAN 2% OF COCOA PROCESSED WITH ALKALI, SOY PROTEIN ISOLATE, CALCIUM CASEINATE, SODIUM CASEINATE, VITAMINS AND MINERALS‡, GUM ACACIA, FRUCTOOLIGOSACCHARIDES, INULIN (FROM CHICORY), SOY LECITHIN, SALT, CARRAGEENAN, NATURAL AND ARTIFICIAL FLAVOR
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In that list, the
highest weight source of protein is from milk protein concentrate. They've been helpful with how much of the protein is coming from soy by listing it after the "less than 2%" section, so even though it's a protein isolate, there's far less soy protein isolate than there is of milk protein concentrate... at least by weight. But there is a difference in the protein content of a concentrate (as little as 25%, but could be as high as 89%) vs an isolate (90%). So that still doesn't tell us all that much. Could be that it really is mostly milk protein, could be evenly split between the 2, could be mostly soy.
Looks like we need to campaign to have the next generation of nutrition labels state how many grams of the total protein content are from plant sources. (Pretty sure that vegans would love for protein source to be expressed that way - and for us LC'ers it would be no different than calculating net carbs by subtracting fiber from total carbs)