Read the following paragraph from the section "Loneliness Can Cause Health Problems.
" Research also shows that having strong social networks can improve the immune system. Scientists call this the "buffering effect." For example, just looking at a photo of a loved one can reduce feelings of pain. Friends and family make people feel safe, which helps their bodies stay more relaxed in stressful situations."
Which phrase from the paragraph helps the reader to understand the meaning of 'buffering effect'?