I just wanted to add that it is very possibly that your yellow feet could also be due to high beta-carotene intake. There are many yellow babies whose parents bring them into the ER panicked, thinking they have liver issues, while they have really just eaten too many squash, carrots and sweet potatoes.
There are many reasons for yellow calloused skin, and I don't assume to know why yours are that color. But beta-carotene is a possible reason.
-tea-