can they do what's promised+are they OK to replace vegs
Although USDA recommendations count 3/4 cup vegetable juice as one vegetable serving, it seems that this is only to encourage people to have the health-protective 5 servings a day. For one thing, the process of juice preparation strongly depends on the juicer type: material of which the shredding mechanism is made, rotation speed, etc. Different types can result in more or less heating due to friction, the degree of oxidation, etc. None of these factors is indicated in the V8 product description, however, it's evident that it's a canned product with inevitable loss of phytonutrients.
Within the V8 family of juices, there also are differences. For example, let's compare V-Fusion with 100% Vegetable Juice
% Daily Values in V8 V-Fusion Juice, 8 fl. oz.
Vitamin A 15%
Vitamin C 100%
Vitamin E 10%
% Daily Values in V8 100% Vegetable Juice, 8 fl. oz.
Vitamin A 40%
Vitamin C 120%
If you take fresh carrots and apples, a cup of each contains much more nutrients than that (see detailed tables: http://atkinszone-recipes.blogspot.com/2011/02/nutrients-in-carrotsapple-mix.htm...)
To juice or NOT to juice卼hat is the question
Food sources of some essential nutrients
Nutrients in foods
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