Many people think that traditions crystallized in Hindhu( Indian) traditions are irrational and superstitious. But, it is based on the scientific findings by our Rishis, who were scientists.
Here, I would like to discuss that why we should sit facing the north? Does it consist any scientific backing? The answer is yes, it is supported by the scientific principle. Human mind is a magnet. Of course, in present days we lost the capacity to recognize the directions. But, in olden days, many people had that capacity. Even now people moving in the forests have that capacity.
Even a student who knows about the basics of magnetism will tell that continuously keeping a magnet in opposite direction to the North for some days will lose its magnetic capacity. Thus, continuously sitting on south side or west side will hamper the magnetic power (Brain) present in our body. It causes the serious problems of Amnesia, nuero problems, etc. Hence, it is requested not sit facing south. Also, sleep keeping your head in South direction, facing the North.
Here, I remind the story in shiva Puranam. When shiva cut off the head of the Vinayaka, a search is made to identify the head to replace it with another head. Kinkarasa brought the head of the Elephant sleeping putting its head in the direction of North, as per the direction of the Lord Shiva. That means no human being was daring enough to sleep keeping their head in north direction in olden days. Knowing the directions was a dire necessity to move from one place to other. There were no direction boards as now it exists.
If your age is above 35, You must definitely sit facing the North during the office hours, as most of the non-sleeping time you spend is in office. Hence, turn your chair facing the North. Vasthu, again a science of constructions, advice to sit facing the North to gain the energy. During the young age one can mitigate the problems. But, as one is turned aged, one can’t tolerate the ailments, as Systems of body start degenerating slowly.
Guptha Vaidya Prakashika , an ayurvedic book written by Doguparthi swami Guptha Siddhanti, advices not to take head bath with the cold water. It is because the power of magnetism decreases in presence of water.
There are some persons ,who levitate against the gravitation force of the earth, a bigger magnet. It can be done when the energy( Prana Shakti) passes through the Sushumna instead of Ida and Pingala Nadis.At this time, the impact of Gravitational force would be nullified on the body. It is possible only after intense practice.
One trivial question may arise in the mind of of some people. Why did not some of our ancestors face problem, even if they do not know about Vasthu and to face to the north. My answer is simple that they ate very nutritious food , worked hard and tolerated odds. The degeneration used to start in them at very late ages between 60 to 80.Also, the cells in the brains would have regenerated, due to their ability. Presently, our regenerating power is very less.
Also, while eating the food, face to the South direction, as your Digestive systems requires more attention that your brain at that time. If your give more importance to brain than digestive system at the time of eating food, it will ruin the digestive system by not releasing the enzymes required by the body.