Having negative thoughts really could make you more illness-prone, say scientists.
A study in the journal Proceedings of the National Academy of Sciences links "negative" brain activity with a weakened immune system.
Researchers from the University of Wisconsin-Madison studied people with high levels of brain activity in a region linked to negative thoughts.
Those with the highest activity levels responded worse to a flu vaccine.
Scientists already knew that pessimists - people rated as more sensitive to negative events - show more activity in a part of the brain called the right pre-frontal cortex.
More activity in the left pre-frontal cortex is linked to positive emotional responses.
Happy thoughts
Dr Richard Davidson, who led the research, studied 52 people aged between 57 and 60.
Each of them was asked to recall one event which made them feel very happy, and one which left them feeling sad, afraid or angry.
The electrical activity in these parts of the brain was measured to check whether their left or right pre-frontal cortex was more active. 
Emotions play an important role in modulating bodily systems that influence our health ".- Dr Richard Davidson, University of Wisconsin-Madison
Afterwards, each volunteer was given a standard flu vaccine shot.
Vaccines work by eliciting an immune response which should hopefully persist and help the body tackle a genuine infection threat if it should arrive.
Each research subject was tested over the following six months to gauge the success of the vaccine by measuring the levels of antibodies generated by the vaccine.
Those who had shown the most powerful right pre-frontal cortex activity also had the worst immune reactions.
The reverse was true for those who had the most powerful reactions in their left pre-frontal cortex, the side associated with happy reactions.
Dr Davidson said:
"Emotions play an important role in modulating bodily systems that influence our health."
"We turned to the brain to understand the mechanisms by which the mind influences the body."
Source: BBC NEWS
Why is it that a lot of people engage their minds easily with unfavorable situations rather than the happy moments?
Why is it that after we go through painful experiences, we play over and over in our minds the same situation that caused the pain?
We reenact that certain moment in our minds, like a broken video player, we playback the drama of our lives in perfect detail that it makes the pain even more unbearable. Then we contemplate and wonder why we always take the same road, and experience all over again the same kind of problem.
Thoughts are incredibly powerful. Anything you mentally focus on, you are attracting in your life. Thoughts have that ultra magnetic power, it attracts the same kind of thoughts, and situations. It brings the same kind of people together.
The known adages, "Birds of the same feather flock together", "Tell me who your friends are and I tell you who you are", the law "Whatever you sow, you shall reap", "What goes round comes around", and The Golden Rule "Do unto others as you would have others do unto you" precisely embodies the Law of Attraction.
Fill your mind with thoughts of prosperity, then you will prosper. Fill your mind with thoughts of success and good health, expect that it will be yours. But if you ponder on difficulties, poverty, sickness, failure, envy, anger, and sadness then you are opening the floodgates of disaster. The Law of Attraction is obedient, what you ask for, you shall receive.
Instead learn to play a movie of loving and unselfish thoughts, gratitude and kindness, perfect health and success, prosperity and abundance, youthfulness and beauty, love and forgiveness then you will live everyday experiencing the miracles of all your desires.
written by : enchantrezz