One of my siblings has hereditary hemochromatosis, so their body retains far more iron than it should. This is not fun. Careful diet helps slow the buildup, but the only effective treatment is blood letting
As an aside, though we usually deride traditional bloodletting, I've recently learned of two conditions bloodletting / blood donation is a useful treatment for: high blood iron level, and high blood viscosity.
Anyway, yes, bloodletting (properly called phlebotomy) is really the only way to deal with it. The first 3 years after my diagnosis my hematologist and I tried out quite a few things to help control it, including diet modifications and different time intervals between phlebotomies. We ended up settling on phlebo every 6 weeks and eat whatever I want.