Inert treatments resembling anticholinergic drugs cause salivation, and insulin-like placebos cause hyperglycemia rather than hypoglycemia. This could be regarded as anticipatory homeostasis. Imagine, a simple starch pill is capable of relieving your headache.
Placebo effect is the healing force of nature.
Firstly, we ought to note that the placebo does not cause anything in the body, it triggers its natural response, which is defined here as the healing force of nature. Like any other response in the organism, the placebo effect was selected in a Darwinian fashion, and today's organisms are equipped with the best placebo effects. Not only humans, any organism in the world is equipped with valuable placebo effects. In any case, the placebo effect is always beneficial since it improves tolerance. Treatment should first exploit the placebo effect and only if necessary supplement it with specific therapy.