Purple Potatoes

Purple potatoes are grown as a color variety of ordinary potatoes. Growers sort harvested tubers for sale, and potatoes that miss produce standards can enter feed channels. The tubers are washed and prepared for cooking.^4,7

1. 01 // Source Purple potato tubers Growers harvest potatoes whose purple flesh gets its color from anthocyanin pigments.
2. 02 // Process Sorted Tubers are graded by size and appearance; potatoes that miss produce standards can enter feed channels.
3. 03 // Process Washed and trimmed Washing removes soil, while trimming removes damaged tissue before the potatoes are prepared.
4. 04 // Output Prepared tubers Cleaned potatoes reach the food plant ready to be cut and cooked into the recipe.

1. 01

   Supplies starch energy

   Potato starch is the main food contribution. Cooking makes it easier to digest, and a complete dog diet can use potatoes alongside its protein and fat sources.^1,6,7

2. 02

   Adds visible color

   Anthocyanin pigments give purple potatoes their distinctive flesh. Brands use that color to sell antioxidant benefits, although color alone says nothing about a benefit to dogs.^4,5,12

3. 03

   Uses sorted tubers

   Potatoes rejected from produce markets for size or appearance can enter feed channels. That creates a supply outlet, though a dog food label cannot identify whether its tubers were rejects.⁷

How much A dog trial fed regular potatoes at 26.4% alongside 26.4% potato starch; it did not test an amount for purple potatoes.¹

1. Brands say

   Cooked purple potatoes give dogs useful energy

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   Potato dry matter is chiefly starch. In an 18-month feeding trial, dogs ate a complete food containing regular potatoes and potato starch without a diet-related difference in body condition. The trial did not test purple potatoes alone.^1,6,7

2. Brands say

   Purple pigment protects a dog's cells

   Outruns the evidence

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   Purple potato flour contains anthocyanins, and cooked potato extracts reduced oxidative signals in a human colon cell assay. That is laboratory activity, not evidence that purple potatoes protect dogs at pet food servings.^4,5,12

3. Brands say

   Purple potatoes are healthier than white potatoes

   Outruns the evidence

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   In one flour comparison, purple potato had 6.56% protein versus 6.49% for yellow potato and less total fiber. Its pigment differs, but no dog trial shows that color makes the whole diet healthier.^4,12

4. Owners say

   Potatoes cause heart disease in dogs

   Outruns the evidence

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   FDA reports involving some grain-free diets do not show cause. A company-funded trial of 60 dogs found no clinical DCM on its potato diet. Cardiologists disputed changes in the pea diet group, and the authors defended their interpretation.^1,2,3,8

5. Critics say

   Purple potatoes are just filler

   Outruns the evidence

   Evidence

   1. Strong
   2. Some
   3. Thin
   4. None

   One purple potato flour measured 82.15% carbohydrate on a dry basis, and potato carbohydrate is chiefly starch. Cooked potato has an energy job in a recipe; it does not replace the recipe's protein sources.^4,6,7