Vastu is a science which uses climatology and astronomy to make its principles. It takes into account geography and natural forces to guide people to construct their places of living and working. It teaches us to balance out energies to create a peaceful and prosperous atmosphere.
Vastu aim's to Balance the Energy. Also, it is a science. Where ever the energy is good you can perform very well. If the energy is less or negative the performance in our routine and official life will not be good. The same concept will apply to our human body function system.