1 Ghrelin is a fast-acting hormone that plays a vital role in meal initiation and contributes to weight gain. 2  Leptin mediates long-term regulation of energy balance and suppresses food intake, thereby inducing weight loss.  Both hormones can be controlled naturally, primarily though exercise and stress management.
Surgical retractors. A retractor is a surgical instrument with which a surgeon can either actively separate the edges of a surgical incision or wound, or can hold back underlying organs and tissues, so that body parts under the incision may be accessed. The two are each available in many shapes, sizes, and styles.
A Balfour retractor is used to hold open abdominal incisions during surgery. Veterinarians may utilize a Balfour retractor during surgery. A Balfour retractor may be used to expose the vocal cords of a horse. Laparoscopic surgeries eliminate the need for a Balfour retractor.