Effects of too low high density lipoprotein in human body function?

No real impact: If otherwise genetically normal, no real clinical issues.

Increased Artery Ds: The beta lipoproteins distribute fat molecules around the body in the water outside cells. The smallest, ldl, are the particles which primarily drive arterial disease if not at very low concentrations. The Alpha lipoproteins are the key organizing proteins of the HDL particles, which can pick up and remove excess fat from cells that are fat overloaded. Thus LDL vs. Hdl are a balancing functions.