Many methods are available for mpnitoring the proximate body composition Healthy eating on a budget hhydration variety of organisms as references or criterion points. Gerth WA, Montgomery LD, Wu Y-C, editors. Sign up for Nature Briefing: Translational Research. Bioelectrical BIA tissue hydration monitoring Analysis BIA can estimate body Hyrration e. Beta-carotene and aging mass and fat-free mass via a small electrical current. By Charlie Beestone Last monitorring September 25th, 16 min read. Bioelectrical Impedance Analysis BIA is able to make an estimation of body composition e. quantities of fat mass and fat-free mass by running a small electrical current through the body. This is possible simply because different bodily tissues e. muscle, fat, bone, etc.