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.Overeating 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 a...