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experts call friction—environmental         a conscious decision, but Wood argues
          factors that render us less likely to       that these are prime examples of habits
          engage in a particular behavior. Friction   “that have become so trained into our
          is everywhere: the impossible-to-resist     minds, schedules, and interactions
          cookies stashed in your pantry that         that no thinking or decision-making is
          make you less likely to stick to nutrition   involved.” It’s what allows us to get to
          goals; the social media apps on your        work each morning without mentally
          phone that distract you from work; the      exhausting ourselves by planning
          Netflix autoplay feature that cues up the   every movement. The area of the brain
          next episode of your favorite show when     that governs these automatic habits
          you really should get to sleep. The trick,   is called the sensory motor system,
          says Wood, “is to increase friction on      and it develops habit memory when
          behaviors we don’t want and decrease        we repeat a sequence of events over
          friction on those we do want.”              and over. If you find yourself automat-
                                                      ically pulling a bottle of wine out of
                                                      the fridge when you prepare dinner or
              TRY THIS: If you’re trying to
                                                      reaching into the chips bowl while you
              kick a procrastination habit, delete
                                                      watch TV, it’s because you’ve trained
              time-sucking apps from your phone
                                                      your sensory motor system to do so.
              and computer and set up a dedi-
                                                         The trick to building a healthier habit,
              cated workspace, like in a home
                                                      Wood says, is to harness your mental
              office or at a local café. Looking
              to eat less meat? Sign up for a         system to work for you, not against
              vegetarian-based meal-delivery          you. Do this by building habits you can
              service for a few days a week. Much  repeat without even having to think
              like a direct deposit program that      about them: Stash your phone in your
              automatically sends part of your        glove box—or even your trunk—when
              pay to your savings account, “just      you get in the car; ask your server to
              the act of making [your desired         box up half your meal before serving it;
              habit] easier makes you more likely     grab an apple every night before settling
              to stick to your goal,” Wood says.      in on the sofa to watch TV. The first
                                                      time will be the hardest, she says, but it
                                                      grows incrementally easier as you build
          2. Repeat a                                 this habit version of muscle memory.

          new habit until                             Research suggests that different behav-
                                                      iors tend to require different amounts of
          it’s on autopilot                           repetition before becoming automatic:

          Using the turn signal in your car to        Adding a piece of fruit to your diet takes
          change lanes or kissing your partner        about 65 days; drinking something
          goodbye in the morning may seem like        healthy, 59 days; exercising, 91 days.


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