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A comment on Exercise Releases Brain-Healthy Protein. Parent comment
With long term phenotypes like brain health, there probably isn't enough selective pressure to create or maintain this relationship.
Rather this result is likely the result of coincidence, and that coincidence was not deleterious enough to be removed by selection. Ex :
Exercise stimulates repair enzymes > Excess Repair Enzymes Filter Into Blood Stream > Excess Repair Enzymes Also Fix Brain Cells.
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With long term phenotypes like brain health, there probably isn't enough selective pressure to create or maintain this relationship.
Rather this result is likely the result of coincidence, and that coincidence was not deleterious enough to be removed by selection. Ex :
Exercise stimulates repair enzymes > Excess Repair Enzymes Filter Into Blood Stream > Excess Repair Enzymes Also Fix Brain Cells.