Soy protein can be included in black bean burgers bought and distributed through USDA programs. It isn't mandatory.

Like most plant foods, tofu contains several antinutrients ... lower blood sugar and insulin levels than those who ate no soy protein. The soy isoflavones found in tofu may be partly responsible.

a Veggie Burger must contain: 1. Soy Protein 2. Vegetable Oils (such as soybean, canola, or sunflower),” reads the X post. "This is after significant lobbying from Impossible Foods and soy farmers." ...