Ayurveda definition and function of Rasa Dhatu or lymph  Rasa
dhatu is formed when agni digests food. When food is completely
digested with the help of normally secreted digestive juices,
the nutritive part of the digested food is called as rasa. This
nutritive juice nourishes all cells and tissues of body. It is
analogous to extra cellular and intracellular fluids.
Importance of rasa:  "Rasajam purusham vidyaat rasam rakshet
prayatnatah annath paanathcha mathimaan aahaaraatch
apyathandritah"  Rasa dhatu contains all the nutients required
to nourish body. Hence ayurveda achaaryas mention human body as
product of rasa. As rasa dhatu nourishes body and helps to keep
it healthy, we should always put efforts to protect rasa dhatu.
This can be done by consuming healthy food, plenty of liquid
like water , milk etc and practicing healthy lifestyle.
Indigestion impairs quality of rasadhatu.  What happens when
rasadhatu decreases? or rasa dhatu kshaya  "Rase roukshyam
shramassoshoglani shabdaasahishnutha"  When rasa