A new vaccine could soon be helping people battle obesity, according to a new study in the Journal of Animal Science and Biotechnology.

The vaccine is known as "flab jab" and it works by stimulating the immune system to attack a hormone that slows down your metabolism and helps you gain weight.

Mice who were administered the drug dropped 10 percent of their body weight in only four days.

Although the vaccine is still in the testing phase, researchers are optimistic the drug could provide a breakthrough in the battle against obesity.

"This study demonstrates the possibility of treating obesity with vaccination," Lead researcher Dr. Keith Haffer, from the U.S. company Braasch Biotech in South Dakota, said.

"Although further studies are necessary to discover the long-term implications of these vaccines, treatment of human obesity with vaccination could provide physicians with a drug and surgical-free option against the weight epidemic," he said.