What distinction is typically made between true kidney beans and common small red beans?
Kidney beans are typically larger and more distinctly kidney-shaped
While both kidney beans and small red beans are categorized within the legume family and share many nutritional similarities, they are distinct varieties. The primary morphological difference cited is one of size and shape: true kidney beans possess a more substantial size and a characteristically pronounced, elongated kidney contour. In contrast, small red beans are, as their name implies, smaller overall. These subtle differences in physical structure also translate into slight variations in their starch content and textural profile, which dictates how well they maintain their integrity during prolonged cooking in applications like stews or chili.

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Kidney Beans 101 - Nutrition and Health Benefits - YouTube