Traditionally, some textbooks from the United States used a system of six kingdoms (Animalia, Plantae, Fungi, Protista, Archaea/Archaeabacteria, and Bacteria/Eubacteria) while textbooks in Great Britain, India, Australia, Latin America and other countries used five kingdoms (Animalia, Plantae, Fungi, Protista and Monera).
For other uses, see Placebo (disambiguation) and Placebo effect (disambiguation). The placebo effect can be produced by inert tablets, by sham surgery, and by false information, such as when electrical stimulation is turned off in those with Parkinson's disease implanted brain electrodes.
Potential causes of unexplained weight loss include: 1  Addison's disease (adrenal insufficiency). 2  Cancer. 3  Celiac disease. 4  Changes in diet or appetite. 5  Changes in sense of smell. 6  Changes in sense of taste. 7  COPD. 8  Crohn's disease.