Very inconsistent black bean nutrition labels?
Why are the calories and protein of these black beans so different:
From Carral beans, for 100 g:
- 203.4 kcal
- 22.8 g protein
From NCCDB Black Beans, Cooked, for 200 g or 100 g dry:
- 264 kcal
- 17.7 g protein
From FDA's FoodData Central, for 100 g:
- 24.4 g protein (2016 data)
From Nutritionix 0.5 cup, 97 g:
- 331 kcal
- 21 g protein
The Carral and Nutritionix protein isn't that far off. Although, the equivalent cooked vs dried protein is, imo, significantly different. And the ~200 vs ~260 vs ~330 calorie difference is intriguing.
Summary of largest disparities:
- 203 vs 331 kcal
- 17.7 vs 24.4 g protein
Any information on why differences exist will be appreciated. Also, I really love primary sources, so please link academic sources--greatly appreciated!