Caffeine is a natural stimulant that works in your brain by blocking the effects of adenosine, an inhibitory neurotransmitter  . This increases neuronal firing in the brain and releases other neurotransmitters like norepinephrine and dopamine which improves mood, reduces stress, increases vigilance and reaction time and general brain function  .
Lower Risk of Multiple Sclerosis. Recent research showed that at least 4 cups of coffee a day may help protect against the development and reoccurrence of MS. It is believed that the coffee prevents the neural inflammation that possibly leads to the disease developing. The study was published in the Journal of Neurology, Neurosurgery & Psychiatry.
Again, it's the caffeine working here. Your recommended maximum amount of caffeine is 400 milligrams, roughly the amount that you’ll get from 4 cups of coffee. If you’re caffeine-sensitive, be careful with coffee. You are probably already aware what amount and what kind of coffee suits, or doesn't suit you. The amount of caffeine that is safe for human consumption is actually written in our DNA.
Slowly decrease the amount of cream and sugar you add into your coffee- Once you have established your baseline of how much of each additive you put into your coffee, reduce the amount by a quarter or half every couple weeks. If you do not find it enjoyable (which is probable) stick with it for two weeks before going back to the original dosage. You may find when you return to your original dosage that it is too milky or sugar forward for you after all.
Good news to all those coffee lovers out there: That cup of joe has quite a few health benefits, as long as you don't load it up with cream and sugar. A number of health organizations agree: The World Health Organization in June 2016 took coffee off the list of potentially carcinogenic foods, stating that java possibly protects again certain cancers, while the 2015 Dietary Guidelines Advisory Committee declared that three to five cups of coffee a day can be part of a healthy dietary pattern. In fact, research shows that black coffee can have a positive effect on conditions including diabetes, dementia and depression.