Changes

The process of nourishment of ''dhatus'' is explained by three analogies: ''Ksheera-dadhi'' (milk curdling analogy), ''khalekapota'' (analogy of pigeons picking up the choicest grains) and ''kedari-kulya'' (irrigation analogy).

The process of nourishment of ''dhatus'' is explained by three analogies: ''Ksheera-dadhi'' (milk curdling analogy), ''khalekapota'' (analogy of pigeons picking up the choicest grains) and ''kedari-kulya'' (irrigation analogy).

==== Ksheera-dadhi nyaya (milk curdling analogy) ====

==== ''Ksheera-dadhi nyaya'' (milk curdling analogy) ====

According to this analogy, the nourishment of a dhātu takes place according to the rule of conversion (of one substance into another). Just as the milk is converted into different forms (from milk to curd, curd to butter, butter to ghee) successively, the preceding dhātu too is converted into the next one. The sequence of this conversion is as follows: rasa - rakta - māṃsa – meda – asthi – majjā – and - shukra in the same order.  

According to this analogy, the nourishment of a ''dhatu'' takes place according to the rule of conversion (of one substance into another). Just as the milk is converted into different forms (from milk to curd, curd to butter, butter to ghee) successively, the preceding ''dhatu'' too is converted into the next one. The sequence of this conversion is as follows: ''rasa, rakta, mamsa, meda, asthi, majja'' and ''shukra'' in the same order.  

The transformation of various substances that takes place due to various biochemical reactions could be one way of understanding this analogy. For instance, the process of glycolysis involves different enzymes acting on different substrates at different steps and converting them from one to another. The ability of one kind of stem cell derived from one tissue in giving rise to different forms of cell types of different tissues is known. The response of mesenchymal stem cells to certain stimuli such as hypoxia in the form of migration and tissue regeneration is also known, which can further support this analogy.

The transformation of various substances that takes place due to various biochemical reactions could be one way of understanding this analogy. For instance, the process of glycolysis involves different enzymes acting on different substrates at different steps and converting them from one to another. The ability of one kind of stem cell derived from one tissue in giving rise to different forms of cell types of different tissues is known. The response of mesenchymal stem cells to certain stimuli such as hypoxia in the form of migration and tissue regeneration is also known, which can further support this analogy.