1. Taste: White kidney bean black coffee tastes sweeter and can be blended with milk; Ordinary black coffee tastes bitter and most people don't like it.

2. Efficacy: White kidney beans and black coffee lose weight more obviously; Ordinary black coffee is mainly used for refreshing.

3. Color: The color of white kidney bean black coffee is light brown or beige; Ordinary black coffee is dark brown or black in color.

4. Taste: White kidney bean black coffee tastes smooth and has starch texture; Ordinary black coffee tastes bitter.

To sum up, white kidney bean black coffee and ordinary black coffee are different in taste, efficacy, color and taste.