  A human body digital twin (DT) is a virtual representation of an individual's
physiological state, created using real-time data from sensors and medical test
devices, with the purpose of simulating, predicting, and optimizing health
outcomes through advanced analytics and simulations. The human body DT has the
potential to revolutionize healthcare and wellness, but its responsible and
effective implementation requires consideration of various factors. This
article presents a comprehensive overview of the current status and future
prospects of the human body DT and proposes a five-level roadmap for its
development. The roadmap covers the development of various components, such as
wearable devices, data collection, data analysis, and decision-making systems.
The article also highlights the necessary support, security, cost, and ethical
considerations that must be addressed in order to ensure responsible and
effective implementation of the human body DT. The proposed roadmap provides a
framework for guiding future development and offers a unique perspective on the
future of the human body DT, facilitating new interdisciplinary research and
innovative solutions in this rapidly evolving field.
