Historically, a human being was not necessarily a natural person in some jurisdictions where a slave was a thing (subject of a property right) rather than a person. In many cases, fundamental human rights are implicitly granted only to natural persons.
Phenylalanine amino acid > Tyrosine amino acid > L-Dopa > Dopamine > Norepinephrine > Epinephrine. Mucuna pruriens is an herb that contains a small percentage of natural L Dopa. Mucuna pruriens is available without a prescription. For more information on mucuna pruriens and levodopa, click on the link provided.
Dopamine Link to ADHD and Obesity. Different studies have hypothesized about the link between obesity and ADHD. One hypothesis is that dopamine comes into play in both conditions, thus linking them together. Researchers Benjamin Charles Campbell and Dan Eisenberg (2007) note that dopamine levels in the brain increase when food is present, even if the person does not eat it.