Negated form: "Attending parties isn't a direct indicator" uses the negated form, providing a counterexample, enhancing the complexity and logicality of the sentence.
Noun phrase as subject: "Health is a multifaceted concept" with "multifaceted concept" as the subject, emphasizes the complexity and breadth of health.
Present participle phrase as modifier: In "cooking nutritious meals," "cooking" as a present participle phrase modifies "nutritious meals," describing specific ways of a healthy lifestyle, increasing the descriptiveness and practicality of the sentence.
Object clause: In "proving that social interaction isn't a prerequisite," this part is an object clause, serving as the object of "proving," used to illustrate the relationship between social interaction and health, enhancing the argumentative strength and complexity of the sentence.