How breast milk can help you prevent the spread of HIV/AIDS

Breast milk is a key source of nutrition for babies and infants, with a wide range of health benefits for the immune system, the brain, the liver and the heart.

But what happens to it when you get old?

Breastfeeding has been shown to increase the production of the proteins that protect the body against infections.

Researchers are now trying to understand how breast milk’s benefits extend beyond its nutritional benefits.

New Scientist investigates.