Please be sure to eat all the food that is recommended on the Nutrisystem meal plan. You could be at risk of health issues if you do not maintain a healthy diet. 1  If you're pregnant, you may not join the Nutrisystem program.  If you're a nursing mother, you may not join the Nutrisystem program.
Quick Answer. According to The Free Dictionary, etiology, also spelled aetiology, is the study of exploration of the cause or factors contributing to something. In pathology, it specifically denotes the investigation into the cause or origins of a disease.
Word History: The changed meaning of the word artery provides a glimpse into the history of medical science. The word is derived from the ancient Greek artÄriÄ, a word originally applied to any of the vessels that emanated from the chest cavity, including arteries, veins, and the bronchial tubes.