Ennui. (ahn-WEE)
The inability to perform acts voluntarily or to make decisions
There is a medical term that implies you are not supposed to eat or drink for about 12 hours before a surgery, and that is 'NPO' or 'Nil Per Os.' That is not a term that implies you should only be on IV nutrition, however.
Objective is the medical term meaning without emotion.
Clubbing is the medical term for the changes in fingernails or toenails associated with chronic lack of oxygen.
Wernicke's encephalopathy is the medical term meaning degenerative brain disorder caused by lack of thiamine.
Acapnia is the medical term meaning lack of carbon dioxide
elimination
An asthenia is a medical term for a weakness or a lack of strength.
If you are referring to lack of or poor muscle tone then "hypotonia" is the correct medical term for low tone, and "atony" for absent tone.
lack of confidence, you will always give up , gaining more wieght
Lack of physical fitness is often called "deconditioning".
atrophy