our birth constitution is best revealed by the fixed attributes of our physical body, particularly our bodily frame and long term weight tendencies. our metabolism and digestion over time is anther good one. life long habits and proclivities and lifelong disease tendencies are other important indicators.
though we tend to stay the same throughout life, long term illness can change that, especially if one is a dual type. sometimes the constitution changes with age or we can experience transitions relative to daily or seasonal changes.