1.  No Breakfast   
People   who do not take breakfast are going to have a  lower blood  sugar level. This leads to an  insufficient supply of nutrients to  the brain  causing brain degeneration. 

2   . Overeating=2   0
It  causes hardening of  the brain arteries, leading to  a decrease in mental power.  

3.   Smoking   
It  causes multiple  brain shrinkage and may lead to  Alzheimer disease.  

4.   High Sugar  consumption  
Too  much sugar will  interrupt the absorption of  proteins and nutrients causing  malnutrition and  may interfere with brain development.   

5.   Air Pollution   
The  brain is the  largest oxygen consumer in our 20  body. Inhaling polluted air  decreases the supply  of oxygen to the brain, bringing about a  decrease  in brain efficiency. 

6   . Sleep  Deprivation  
Sleep  allows our brain  to rest.. Long term deprivation  from sleep will accelerate the death  of brain  cells.. 

7.   Head covered  while sleeping  
Sleeping  with the head  covered increases the concentration  of carbon dioxide and decrease  concentration of  oxygen that may lead to brain damaging effects   

8.   Working your  brain during  illness  

Working  hard or  studying with sickness may lead to a  decrease in effectiveness of  the brain as well as  damage the brain. 

9.   Lacking in  stimulating  thoughts  
Thinking   is the best way to train our brain, lacking in  brain  stimulation thoughts may cause brain  shrinkage.  

10.   Talking Rarely   
Intellectual   conversations will promote the efficiency of the  brain.