A person's drowsiness or fullness after a meal is related to the protein in the food they eat. Most proteins contain an amino acid called tyrosine, which enters the brain to promote the formation of dopamine and neoadrenaline, which makes a People are excited. Birds and fish contain the most tyrosine, but not all tyrosine-containing foods excite the brain. * Tyrosine is found in meat, but fat hinders its absorption. From above can be introduced:. ['Foods with more protein are more conducive to intellectual development.', 'Protein in fish is easy to digest and absorb.', 'Fish is rich in dopa gums.', 'Dry fish with more fat in the meat.']