You only lose ~80ml of blood. When you donate to the blood bank your giving ~500ml and I've never heard of anyone recommending liver, other than not having an empty stomach there's no special dietary changes necessary.

Am I missing something?

> You only lose ~80ml of blood.

That's an average.

Almost all the women I have known occasionally complain about a "heavy month" every now and then. That can be either excessive bleeding in terms of volume lost over a normal time or an excessive time length of bleeding.

And, a 90lb female losing even 200ml of blood is going to feel effects far more than a 250lb male losing 500ml.

My mother ate liver and onions once a month. It might not have been necessary, but it's still something she did.