Soybean Meal

Oil mills extract soybean oil for food and other uses. The solids retain substantial protein, so processors heat and grind them into a meal that also goes into animal feed and pet food.³

1. 01 // Source Whole soybeans Oil mills receive soybeans and may remove the fibrous hulls before extracting oil.
2. 02 // Process Cracked and flaked Breaking and flattening the seeds exposes more of their oil to the extraction process.
3. 03 // Process Oil extracted Most mills use a solvent to remove oil; mechanical presses leave more oil in the meal.
4. 04 // Process Heated and ground The remaining flakes are heated to reduce trypsin inhibitors, then dried and ground.
5. 05 // Output Soybean meal The dry meal supplies concentrated protein to feed makers and pet food plants.

1. 01

   Supplies usable protein

   Soybean meal raises the recipe's protein total. Dog feeding studies found that balanced foods using it maintained intake while supplying digestible protein.^1,6

2. 02

   Balances other proteins

   Soy supplies lysine, while its methionine is relatively low. Formulators pair it with other protein sources or added amino acids to balance the finished food.^3,4

3. 03

   Helps control recipe cost

   Oil extraction creates a widely available protein meal. Using some of it lets manufacturers buy less animal protein, although the bag cannot reveal their ingredient costs.^1,3

How much A 24-week dog trial replaced up to 30% of dried chicken protein with soybean meal in complete diets.⁶

1. Brands say

   Soybean meal gives dogs usable protein

   Evidence

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

   A 24-week trial found no diet-related change in intake or body weight when soybean meal replaced some chicken protein. A review of 17 dog studies found protein digestibility often rose. These findings concern balanced foods.^1,6

2. Owners say

   More soybean meal makes stools softer

   Evidence

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

   In a 12-dog digestibility study, increasing soybean meal lowered fecal dry matter and raised stool output. A broader review found mixed stool results, so the effect depends on the recipe and the dog.^1,6

3. Owners say

   Soy can trigger food allergies

   Evidence

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

   A review found soy reactions in 18 of 297 dogs with proven food reactions. Soy allergy is real, but those dogs were selected for food problems; the count does not measure risk among all dogs.²

4. Critics say

   Soybean meal is just filler

   Outruns the evidence

   Evidence

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

   Type 48 soybean meal averages 52.6% crude protein on a dry matter basis. Dog feeding studies show that protein contributes to balanced diets. Calling it filler ignores its nutritional job.^1,4,6