Compared to the cells in a healthy body, Elisa’s cells are getting far fewer molecules.

Glucose

Explanation:

This question is taken from a story that's on the internet titled "diagnosing Elisa".

Now, the diagnosis of Elisa found out that Elisa felt tired because her cells were not getting the daily amount of molecules they required from food and air and this made her cells not to function, grow & repair efficiently. In addition, the diagnoses further explained lack of molecules to mean that although that Elisa's cells were getting sufficient oxygen and amino acids molecules, but did not get sufficient glucose molecules.

i believe that it is a exoplanet