| 1 | The liver is your largest internal organ. | |
| 2 | A smaller gut could therefore support a larger brain. | |
| 3 | Its cells don't divide like skin cells or gut cells, however. | |
| 4 | The backs of vertebrates evolved as a kind of horizontal pole under which guts were slung. | |
| 5 | However, a 2009 study in the Netherlands found that smokers had more visceral fat than nonsmokers. |
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