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Investigators      the situation. If our mental states are too brittle,  of consciousness needs enough flexibility that

                     have     however, we may act violently without warning,  we are able to manipulate it as each thought ap-
                              giving neither ourselves nor those around us any  proaches, choosing either to let it pass through or
               estimated      opportunity to recognize what is happening and  to hold on to it. This net also needs enough stabil-
               that up to     intervene. Alternatively, too much methylation  ity, however, to hold onto beneficial thoughts for

          73 percent of       could make our minds like a bowl of liquid clay:  as long as they are needed. Without flexibility,
                              easy to make a mess with, but difficult to shape  we hold onto everything that comes our way
             vegetarians      into something beautiful or useful.        indiscriminately. Without stability, we cannot
                  and 90          In the second analogy, we could consider our  hold onto anything at all. With a proper balance,
              percent of      consciousness like a net through which thousands  we become masters of our thoughts rather than
                              of thoughts fly every day. These thoughts could  their captives.
              vegans are      be about basic biological drives and needs like     Evidence from genetic studies supports the

             deficient in     food, sex, and sleep; they could be about the  role of methylation in maintaining this balance.
             vitamin B .      multitude of things we need to get done; or they  Some of us have a high or low rate of methylat-
                         12   could be thoughts that motivate us, whether to  ing dopamine for genetic reasons. In those who
                              do good things or to do things that would get us  methylate dopamine at a low rate, unpleasant
                              into trouble. To achieve mental health, our net  pictures cause a dramatic stimulation of activ-













































          FIGURE 4: Optimal mental health requires a balance of mental stability and flexibility, which in turn requires a level of
          methylation that is “just right.” Too much methylation will contribute to too much flexibility, making us too easily distracted
          and unable to hold onto beneficial thoughts and mental states (A). Not enough methylation will contribute to too much
          stability, making us unable to tolerate healthy amounts of change, and making our mental states “brittle,” which means that
          any given mental state will take a lot of energy to break and the transitions will never be smooth (B). A balanced level of
          methylation will contribute to the appropriate balance between mental stability and mental flexibility, which will support
          vibrant and robust mental health (C).
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