You may be right. But all of the suggested benefits seem like they should effect intelligence:

  - Higher frequency brain waves increase 'attention, memory, and information processing'

  - A heightened visual cortex increases our ability to pick out features in our environment

  - Restocking neurotransmitters to optimal levels

  - Healthier blood vessels improve working memory

these are all forms of 'intelligence' in a piece of life. I say if our body has transformed its blood vessels into a more 'healthier' state then the overall organism is operating more intelligently. Just not the type of intelligence associated with analyzing our external environment.