Could this be used in weight loss?

Failure to thrive is a medical term which denotes poor weight gain and physical growth failure over an extended period of time in infancy. Often abbreviated FTT, the term has been in medical use for over a century. As used by pediatricians, it covers poor physical growth of any cause and does not imply abnormal intellectual, social, or emotional development.

In adult medicine, failure to thrive is a descriptive, non-specific term that encompasses "not doing well": e.g. malaise, weight loss, poor self-care that can be seen in elderly individuals.

Recently the term 'faltering growth' has become a popular replacement for 'failure to thrive', which in the minds of some represents a more euphemistic term.

-http://en.wikipedia.org/wiki/Failure_to_thrive