Final answer:
Exchanging gifts of appreciation is a sign of a healthy provider-patient relationship.
Step-by-step explanation:
A sign of a healthy provider-patient relationship is exchanging gifts of appreciation with each other. This shows mutual respect, gratitude, and a positive rapport between the provider and patient.
On the other hand, borrowing money from the patient, working on a weight-loss program for the patient, and investing in a business venture together are not signs of a healthy provider-patient relationship. These actions can create conflicts of interest, blur professional boundaries, and compromise the trust and objectivity required in the relationship.