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Scientists have discovered a link between eating nuts and higher levels of serotonin (the feel-good brain chemical) in the human body.
Serotonin is responsible for transmitting nerve signals and improves heart health and makes people happier. It causes the feeling of safety calmness, happiness and self-confidence. Deficiency causes low self-esteem, obsessive thoughts, compulsive behaviour, impulsiveness and aggressiveness.
All you need is 1 ounce of hazelnuts.