Being truly happy is an achievable state of mind. One only needs to be guided and the rest is up to the individual to put into practice. Being truly happy does not only have positive effects on the body but it also effects the condition of the mind.
There are many scientific and natural therapy ways to achieve some level of happiness. With practice and conscious perseverance it is possible to achieve almost complete true happiness.
Read this book to learn more about your own state of happiness.