We don't need to understand all the biology and chemistry to have brain health.
A few things to start:
1. Be careful what you allow into your brain through your eyes, your ears, your mouth, and your skin.
2. As always, healthy food, exercise and good sleep.
3. Try a little mindfulness, just 5 minutes /day spent quietly noticing what you hear, see, and feel can provide a break from the constant busy ness that has become a way of life.
Help your body take care of you by drinking enough water; if you have a persistent cough, an accessible, economical treatment is being well hydrated.
Think of the cilia in your respiratory tract as hairs that protect your lungs. They work best when well hydrated- your body uses the water you drink to hydrate essential parts, including the cilia.
There are other things that can help, but reaching for water first, before things get severe can be a good idea.
Our bodies have great abilities to adapt to too much or too little water; because of this, we can be complacent and not notice when improving the quality or having a glass of water instead of a different beverage can improve how we feel. Filtered water in a glass or stainless water bottle is healthier than a plastic bottle.
If you are feeling hungry, listless or tired, have a big glass of water and notice if you feel better, there's a good chance it will help.