Everything that goes into your body can be found in the hair when it is analyzed. The process of analyzing hair is called "trichology" and trichologists are highly trained to spot anything withing the microscopic internal structure of the hair (an aspirin can be detected within 8 hours after consumption and illnesses such as anemia and cancer can be diagnosed because of the effects they produce within the hair's internal chemistry).
Hair grows approximately 1/2 inch per month in most people (some more, some less) and the hair that is 1/2 inch away from the scalp can still receive nutrients or damaging effects from what we put in our bodies. Every hair has its own blood supply, nerves, and muscles.
Everything we consume goes into our hair's internal structure. As a rule, if we eat fairly healthy diets, get plenty of sleep and enough exercise, and don't damage our hair with chemicals, our hair will be healthy.
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