Diamond Cat Food Review

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Overall Rating



  • Inexpensive


  • Contains too many harmful ingredients
  • Only available in one flavor and one formula
  • Too many negative reviews from cat owners

Diamond cat food is a brand often synonymous with quality. Diamond pet food has been around for several years, offering pet parents exclusively healthy formulas for their pets. However, there are many cat food formulas available, how can we tell if their standard formula is best for cats?

We’ll find out in this honest Diamond cat food review.

For this review, I will be focusing on the Maintenance Cat formula.

*Disclaimer: This website contains affiliate links and I may earn a commission from qualifying purchases as an Amazon Affiliate when you click on the links on this post at no additional cost to you. Read my full disclaimer here*

Diamond cat food

My Honest Diamond Cat Food Review


Name: Diamond

Website URL: www.diamondpet.com

Flavors Available: Chicken

Formulas Available: Maintenance

Sizes Available: 6 ounces, 6 pounds, 20 pounds, and 40 pounds

Overall Rating: paw print rating


Guaranteed Analysis

Crude Protein 30.0% 

Minimum Crude Fat 15.0% 

Minimum Crude Fiber 3.0% 

Maximum Moisture 10.0% 

Maximum Calcium 0.8% 

Minimum Phosphorus 0.65% 

Minimum Selenium 0.3 mg/kg 

Minimum Vitamin A 15,000 IU/kg 

Minimum Vitamin E 100 IU/kg 

Minimum Taurine 0.1%  

Minimum Omega-6 Fatty Acids* 2.4% 

Minimum Omega-3 Fatty Acids* 0.4% 

Minimum Total Microorganisms* (Lactobacillus plantarum, Bacillus subtilis, Lactobacillus acidophilus, Enterococcus faecium, Bifidobacterium animalis)Not Less Than 80,000,000 CFU/lb


Pros. vs. Cons.


  • Inexpensive


  • Contains too many harmful ingredients
  • Only available in one flavor and one formula
  • Too many negative reviews from cat owners



Chicken by-product meal, whole grain ground corn, wheat flour, chicken fat (preserved with mixed tocopherols), corn gluten meal, ground white rice, dried beet pulp, natural chicken flavor, flaxseed, fish meal, sodium bisulfate, potassium chloride, choline chloride, DL-methionine, taurine, dried Lactobacillus plantarum fermentation product, dried Bacillus subtilis fermentation product, dried Lactobacillus acidophilus fermentation product, dried Enterococcus faecium fermentation product, dried Bifidobacterium animalis fermentation product, 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.


Ingredient Breakdown

Chicken By-Product Meal

By definition, this ingredient consists of the rendered, ground, and cleaned parts of a slaughtered chicken. This can include the necks, feet, eggs, and intestines. Because of the multiple organs used, it is considered to be a pretty inconsistent ingredient and has questionable nutritional value.

Whole Grain Ground Corn

This ingredient is used as the main source of protein. This is seen as moderately nutritious compared to high-quality meat sources.

Wheat Flour

This is an ingredient that holds little to no nutritional value for cats. It is nothing more than leftover dust from the processing of human-grade food.

Chicken Fat

This is a quality ingredient that is a source of fat, additional protein, and Omega 3 fatty acids which can help contribute to a healthy and shiny coat.

Corn Gluten Meal

This ingredient comes from the dried residue during the corn separation process when the bran is separated from the starch and germ of the corn. It is typically used as a source of protein, although it isn’t considered to be the best source.

Ground White Rice

This ingredient is the de-hulled portion of the rice kernel and ground prior to use. It is typically used as a source of carbohydrates and is used for hypo-allergenic formulas.

Beet Pulp

This is an ingredient that comes from the residue of sugar beets that has been extracted from the sugar manufacturing process. This is typically added to pet food as a means to harden bowel movements.

Natural Chicken Flavor

Just as the name implies, this ingredient is used as nothing more than a flavoring agent. It is also used as a source of additional protein and omega 3 fatty acids.


Flaxseed is used as a source of additional protein, insoluble fiber, omega 6 fatty acids, omega 3 fatty acids, and lignans.

Fish Meal

This is a protein ingredient that can contain as much as 300% more protein than fish contains by itself. The problem with this ingredient is that you are explicitly told what fish is used, making it questionable at best.


Flavors, Sizes, and Price

Diamond Adult Cat Food Maintenance

This formula by Diamond is made with the perfect balance of 30% protein and 15% fat. It is made in the United States so you can be assured by its quality.

Sizes Available: 6 pounds, 20 pounds, and 40 pounds


Diamond Reviews by Cat Owners

Unfortunately, most of the reviews you will find for Diamond cat food are on the negative side. Let’s take a closer look at what some cat owners have been saying about this food below.

“For some strange reason, this food just makes my cat vomit. My cats aren’t prone to upset stomachs usually so I was pretty worried when they vomited from the food for the first time. It may work for other cats, but it doesn’t work for mine.” -Daniela Rodriguez, May 6th

“You get what you pay for. This food is really low quality. But what do you expect from cheap food?” -Mason, April 30th

“This is a really bad food. I have tried feeding this to my cats on and off for years. Every time I try the food, my cats will lose weight or avoid eating the food altogether. It has even contributed to liver failure in one of my cats. It is horrible. Use at your cat’s risk!” -Basically His, May 22nd

“My cat is unhappy with this food. I bought this food from my local Tractor Supply and he immediately hated it. I definitely will not be buying this food again.” -Snowbell, November 28th


Diamond Cat Food: The Bottomline

After carefully looking at Diamond Cat food, specifically their Maintenance formula, it is not a food I would recommend to any owner, regardless of budget. It is just filled with too many harmful ingredients and has too many negative reviews from cat owners. There are healthier alternatives out there that have the same price tag. Avoid at all costs!

Final Verdict: 
Not Recommended


Have you fed your cat Diamond cat food? If so, how did your cat like the food? Did they hate it? Regardless, let me know in the comments section below!

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Diamond cat food


Digital marketing specialist and Internet enthusiast. When Vanessa isn't working on PetFoodio.com or other marketing ventures, she spends her time making homemade dog treats and reading up on the latest advances in the veterinarian field.

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