They found that chimpanzee females use copulation calls strategically to enlist the future protective support of males against aggressive group members, especially other females.

BBC: Monogamy shunned by female chimps

Research has shown that social isolation can be a risk factor for suicide while social support has a protective role.

FORBES: A Vaccine Against Suicide?

He has conducted studies on living neurons which suggest that the tau protein is produced in response to oxidative stress, thus lending support to the protective hypothesis.

ECONOMIST: Dementia

But even then, protective factors like social and family support, education and optimism and emotional self-regulation can provide a safety net for children.

CNN: STORY HIGHLIGHTS