10 Biggest Brain Damaging Habits 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. Over-eating - 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 Alzheimers 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 body. Inhaling polluted air deceases 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.