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6. Alcohol
This shouldn’t even come as a surprise considering all the wrong decisions people make when they are drunk. Having a drink or two every once in a while won’t cause much damage to you however, long term excessive drinking is detrimental to the health of your brain. When you make drinking a habit, your brain shrinks and the alcohol can disrupt the neurotransmitters that your brain require in order for communication to take place. Most alcoholics will experience a deficiency in the very important vitamin B1 and this could lead to the development of Korsakoff’s syndrome, which is responsible for severe brain damage, which brings about confusion, memory loss, unsteadiness and even intermittent loss of eyesight.