Scientific studies have shown how thoughts can impact one’s physical state
The beliefs that we hold and the emotions that we experience have been shown to affect and shape our physical state and consequently, our reality.
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Thoughts cause neurochemical changes. For instance, a grateful attitude caused a surge in rewarding neurotransmitters like dopamine, which is associated with feel-good emotions such as pleasure. The placebo effect is a testament to how powerful thoughts are. As states by Atasoy, our immaterial expectancies, such as the expectation that your actions will result in certain health benefits, can yield tangible physiological and cognitive outcomes.  There are other examples in which thoughts cause change at a cellular level. Each cell in our body has thousands of receptors which are specific to either one protein or one peptide. Emotions release neuropeptides which connect with receptors which in turn changes the cell structure. This happens whenever we experience feelings such as joy, anger, or grief. When a cell is increasingly exposed to peptides that correspond with attitudes such as anger, it produces more receptors that match this peptide when the cell divides. So, whatever one feels on an emotional level will cause cell changes that reflect, accommodate and prioritise the feeling of this emotion in the future.