Hey Moonbear and other Physio types, Do equal volumes of muscle tissue and fat tissue have equal vascularization? how about equal masses of the two? If one body type (muscular) requires more vascularization than another (fat), that means greater blood volume, correct or incorrect? Does greater blood volume mean a greater requirement for iron, in one's diet? ~~~ Another way to ask the question is this: If someone who is out of shape significantly increases their muscle mass through weight training, but doesn't change their general size or weight (just develops more lean tissue and has less fatty tissue), would that person need to increase their iron intake in order to avoid anemic symptoms?