From Samuel Hahnemann’s (The Father – and Founder - of Homeopathy), Organon of Medicine. Aphorism 261 is all about the removal of obstacles (diet, habits, lifestyle, environment). It seems so simple, but sometimes identifying, acknowledging, and the removal of obstacles presents a bigger challenge than adding in something new (that "quick fix").
The most appropriate regimen during the employment of medicine in chronic diseases consists in the removal of such obstacles to recovery, and in supplying where necessary the reverse: innocent moral and intellectual recreation, active exercise in the open air in almost all kinds of weather (daily walks, slight manual labor), suitable, nutritious, un-medicinal food and drink, etc.
Source: Organon of Medicine