I have a question that bugs me a little bit. Is it true that when you wash out the skin of beans, you wash off the protein?
i have heard it that moin moin and akara don't give protein cuz you've peeled the skin.
boiled and cooked bean = more protein
peeled skin = less/no protein.

how true?

I wouldn't say so

the peeled bean still has a lot of protein and I would guess they have the same amount of protein both the peeled and unpeeled .

although  the unpeeled would have more calories than the peeled.

I would also suspect that the outer skin of the bean is not made of protein but cellulose which is a form of carbohydrate but not digested by humans.

Both peeled and unpeeled beans have the same amount of protein.

The protein is in the beans itself, not the skin.