1. It is a specific physiological and psychological process. It involves restoration of the immune system, an increase in the number of neurons in the brain, and a few other changes.
It also involves growth of what are called the subtle human bodies. These are really just energy fields that some people can see around a person. In most people, these remain largely undeveloped. However, a nutritional balancing program alone will cause them to grow much larger and brighter. There is nothing unusual or anti-religious in this understanding, as it does not diminish the importance of physical life whatsoever, and indeed this gives it deeper meaning.
These subtle bodies go by various names. Common ones are the etheric, mental, causal and whole or entire bodies. The names are less important than the concept. Since this is a large subject, a separate article entitled The Chakras describe the bodies in more detail.
2. It leads to a longer, healthier, and usually a much wiser and happier life This occurs because the immune response of the body becomes much more effective in fighting infections, and one is able to eliminate more toxins from the body.
One may also develop special abilities and talents as a ‘side effect.’ For example, one may be able to see subtle energy flows around a person’s body, or perhaps one’s memory becomes much better.