I can understand this thought as total health requires much work and maintenance on the physical, mental and spiritual (along with other levels known and unknown) as well.
In addition, we are all in different stages of health, those further along and more in tune with their bodies may be more aware of and see greater benefit due to the absorptive power of the body.
Two years ago my body was SO terribly gunked up, that nothing I did natural OR unnatural (pharmaceutical drugs) worked; neither did all the poisons I ate and\or drank have much apparent affect either. Today, I feel a BAD food or drink within seconds/minutes and GOOD food or drink is energizing... not to the point i would like, BUT I do feel the difference.