I'm not defending Nutro or anything, just helping sort out some of the facts.

On a list of ingredients, in my experience it's rare that they write on the ingredient list that the minerals are chelated. You have to get that info from a website or request it from the manufacturer. They try to pack so much info on those little labels, and "chelated" before each mineral that is just takes up more room. It's absence on a list means nothing. Here's a link to the nutro site - click on the "Easy Absorption of Minerals" button:
http://www.thenutrocompany.com/nutri...gredients.aspx
Yes, Corn Gluten Meal is the protein part of the grain. But corn is NOT a "high gluten grain." It IS a high starch grain, and the corn gluten is a byproduct of manufacturing corn starch. But for people with Celiac Disease or anyone eating a gluten-free diet, corn is on the OK TO EAT list. !!!!! To be considered gluten free, something must have less that 20 ppm gluten - so corn can't even be considered a "gluten grain" let alone a high gluten grain.
http://www.csaceliacs.org/gluten_grains.php
And the soy protein concentrate is so far down on the list of ingredients, I suspect it's there as a binder.
Compared to most foods out there, Nutro is a healthy choice.
Yes - the problem is that with the corn, rice, wheat, AND soy, it's got a lot of potential allergy triggers in it, and more and more animals seem to be developing some type of sensitivity.
But 4health isn't wheat-free. It's just disguised as cracked pearl barley.
4health Ingredients:
Chicken, chicken meal,
cracked pearled barley, egg product,
ground rice, powdered cellulose, chicken fat (preserved with mixed tocopherols), salmon,
potatoes,
millet, natural chicken flavor,
flaxseed, ocean fish meal, sodium bisulfate, potassium chloride, methionine, choline chloride, dried chicory root, taurine, kelp,
carrots, peas, apples, tomatoes, blueberries, spinach, dried skim milk, cranberry powder, rosemary extract, parsley flake, yucca schidigera extract, L-Carnitine, dried fermentation products of Enterococcus faecium, Lactobacillus acidophilus, Lactobacillus casei and Lactobacillus plantarum, dried Trichoderma longibrachiatum fermentation extract, zinc proteinate, vitamin E supplement, niacin, manganese proteinate, copper proteinate, zinc sulfate, manganese sulfate, copper sulfate, thiamine mononitrate, vitamin A supplement, biotin, potassium iodide, calcium pantothenate, riboflavin, pyridoxine hydrochloride (vitamin B6), vitamin B12 supplement, manganous oxide, sodium selenite, vitamin D supplement, folic acid.
Notice that none of the minerals indicates they're chelated. Also interestingly, the 4Health has probiotics - but no prebiotics (the barley is cracked, not whole).
As to the barley, "Nutritionally, hull-less or pearl barley is not too different from wheat in its caloric, protein, vitamin and mineral content."
http://wbc.agr.mt.gov/consumers/Nutr...ey_basics.html
From just looking at the list of ingredients, there's no way to say definitively that more of the protein comes from plant protein. You can only surmise based on the fact that ingredients are listed in descending order of weight in the content.
Here are the ingredients in Taste of the Wild:
Chicken meal,
peas, sweet potatoes, chicken fat (preserved with mixed tocopherols),
potato protein, roasted venison, smoked salmon, natural flavor, ocean fish meal, methionine, potassium chloride, taurine, choline chloride, dried chicory root, tomatoes, blueberries, raspberries, yucca schidigera extract, dried fermentation products of Enterococcus faecium, Lactobacillus acidophilus, Lactobacillus casei and Lactobacillus plantarum, dried Trichoderma longibrachiatum fermentation extract, zinc proteinate, vitamin E supplement, niacin, manganese proteinate, copper proteinate, zinc sulfate, manganese sulfate, copper sulfate, thiamine mononitrate (vitamin B1), vitamin A supplement, biotin, potassium iodide, calcium pantothenate, riboflavin (vitamin B2), pyridoxine hydrochloride (vitamin B6), vitamin B12 supplement, manganous oxide, sodium selenite, vitamin D supplement, folic acid.
TOTW may be grain free - but it provides a high percentage of protein from peas, certainly (as many grain free foods do).
And last, let's take a look at Blue:
Well, first of all, appealing to our human sense of what's healthy, before I get to the ingredients in the dry food, I come across this: "Healthy Garden Veggies
Whole carrots, sweet potatoes and parsley are three of the nutrient-rich vegetables that your cat will get in every bite of BLUE." Cats do not have digestive ability to process carrots into beta carotene, so carrots in ANY cat food are fiber/filler, period.
Anyway, ingredients in Blue (Healthy Living Chicken & Brown Rice):
Deboned Chicken, Chicken Meal,
Oatmeal, Whole Ground Brown Rice, Whole Ground Barley, Chicken Fat (naturally preserved with Mixed Tocopherols), Salmon Meal, Menhaden Fish Meal (natural source of DHA-Docosahexaneoic Acid), Dried Egg, Natural Chicken Flavor,
Whole Potatoes, Peas, Whole Carrots, Whole Sweet Potatoes, Cranberries, Blueberries,
Flaxseed (natural source of Omega 3 and 6 Fatty Acids), Barley Grass, Dried Parsley, Alfalfa Meal, Dried Kelp, Taurine, Yucca Schidigera Extract, L-Carnitine, L-Lysine, Turmeric, Fish Oil (natural source of Omega 3 Fatty Acids), Oil of Rosemary, Beta Carotene, Vitamin A Supplement, Thiamine Mononitrate (Vitamin B1), Riboflavin (Vitamin B2), Niacin (Vitamin B3), d-Calcium Pantothenate (Vitamin B5), Pyridoxine Hydrochloride (Vitamin B6), Biotin (Vitamin B7), Folic Acid (Vitamin B9), Vitamin B12 Supplement, Calcium Ascorbate (source of Vitamin C), Vitamin D3 Supplement, Vitamin E Supplement, Iron Amino Acid Chelate, Zinc Amino Acid Chelate, Manganese Amino Acid Chelate, Copper Amino Acid Chelate, Choline Chloride, Sodium Selenite, Calcium Iodate, Salt, Caramel, Potassium Chloride, Saccharomyces cerevisiae, Lactobacillus acidophilus, Bacillus subtilis, Enterococcus faecium .
Actually, looking at the ingredients of all these foods, I'd have to say it's quite impossible to tell which ones would shake out as being the highest in animal protein vs. plant protein. I think we'd have to contact the manufacturers for a definitive answer.
In the Blue, I highlighted the flax for a reason - the label reads, "Flaxseed (natural source of Omega 3 and 6 Fatty Acids)."
Yes, in people and dogs, Flax is a natural source of Omega 3 and 6 fatty acids. Cats, however, lack the digestive enzyme D6D (delta 6 desaturase) required to process the ALA / linoleic acid in flaxseed INTO the Omegas.
http://www.ncbi.nlm.nih.gov/pubmed/513981. Flax is approximately 57% ALA, and cats cannot digest it. I've talked about this issue in other nutrition threads, and it upsets me greatly that flax is marketed as some healthy grain alternative for our cats. I was going to let it go for the purposes of this discussion - but Blue specifically states "a good source of omega...." and that's just wrong and misleading, when it comes to a CAT.