Final answer:
The appropriate feeding method for a patient with decreased level of consciousness is Tube feeding or enteral feeding.
Step-by-step explanation:
For a patient with decreased level of consciousness, the appropriate feeding method would be Tube feeding or enteral feeding. This is because in this condition, the patient may not be able to swallow properly or protect their airways, making it unsafe to give them food orally. Nasogastric feeding is a type of tube feeding, where a tube is inserted through the nose and goes down into the stomach to deliver nutrients. Parenteral feeding refers to the administration of nutrients directly into the bloodstream, usually intravenously, bypassing the gastrointestinal tract. This method is typically used when the patient cannot tolerate enteral feeding.