Tips to Improve Your Body’s Immune System

Don’t let yourself freeze

Mom was right: You’re more likely to catch an infection if you—especially your extremities—are cold. In one study, 90 people kept their feet in a bowl of cold water for 20 minutes and the same number put their feet in an empty container for a similar length of time. Five days later, 20 percent of people with chilled feet had developed colds compared with 9 percent of those whose feet stayed warm.