For anyone interested in the uses, economics, etc., of plant chemicals, this source is heavily cited. I was surprised when it came up so high on a search for plant bio-chemicals active in animals, because it is from 1985. I had been under the impression that a lot of this is newer than that. The article laments the loss of forest in the global south. So many of those plants are not even well described yet, in published sources. We are losing humans who know about the plants as well. It is still a relevant issue, as huge dam plans, such as the Belo Monte in Brazil, are threatening ancient forest.
http://www.ciesin.columbia.edu/docs/002-266/002-266.html
There are receptors in plants and animals that are similar. Candace Pert's book about the brain receptors for opiates made a big splash, as did the movie, Molecules of Emotion. I watched that movie many times, as did many in the Portland area, where the movie was partly made.
The discovery of inhibitor-production in plants was big in a different segment of the population. The pesticide implications in agricultural applications were of great interest in some university ag departments, and then scientists began to consider the potential of inhibitors for weight-reduction in humans.
Messing with the different bio-chemicals is a tricky game because of feedback mechanisms. This is one of the reasons for cautions on pharmaceutical bottles that the substance may provoke the symptoms that are being targeted.
When I developed a murderous headache from a strong selective-seratonin re-uptake inhibitor (SSRI - Prozac family), as a result of an attempt to stop side effects of chemotherapy, they got pretty agitated about it and told me to stop right away, for an example of the unpredictability of response. I have played around with St. John's Wort for its reputed anti-inflammatory effects, and I got the headache as well. St. John's Wort has been used in Germany for depression symptoms. I can use St. John's Wort topically, and it feels good on my skin. I have no adverse reaction that way. I just can't ingest it without consequences.
There is a sedative frequently used in emergency rooms, but some people have a violent counter-reaction, and I have heard it said that anyone who has seen that is far less likely to use that medication from then on out. I can't remember the name of it.
It is possible to generate one's own bio-chemicals, in response to vigorous exercise or starvation, for example. This is one reason it is so difficult to treat anorexia with conventional medicine.
People who lived through the seventies may remember a particular appetite-stimulant plant substance, but research on appetite stimulants is far behind research on appetite suppressors in general above-ground scientific research.
The Knight Cancer Research Center at Oregon Health Sciences University has some projects to help tease out how individuals respond to particular substances and how to tailor treatment to individuals. This kind of medicine is often called personal or personalized, but I prefer Functional myself, as I am an exercise instructor interested in seeing people reach goals above baseline.
OHSU's nursing school is doing clinical trials on tai chi and fall-prevention in cancer survivors, and I am a participant. I also participated in the stretching control group for a trial of resistance training, but my own response, and that of others who have testified to this, is that the value of connecting with others with similar challenges was of great value in that group-exercise
experience, separate from the effects on bone, which was the prime research outcome they wanted to test.
I got hissed at a National Alliance for the Mentally Ill (NAMI) meeting for announcing a talk of the book Anatomy of an Epidemic. I am aware I can draw hostility by wanting to talk about individual responses in detail. Nonetheless, the complexity of the subject is not going to go away by hissing people for talking about it. Re-Thinking Psychiatry events now draw a wide circle of interested people, including some from NAMI. I long ago paid $1,000 for a life-time membership in NAMI. There are times I have regretted that, but I am mellowing about it.
Maybe climate won't change much, and we will just chug along without changing trajectories from how we do things now, but I doubt it, so I find it relevant to be curious about this stuff and to watch the research.