Final answer:
The patient should consume more red meat and liver to address pernicious anemia caused by poor absorption of vitamin B12.
Step-by-step explanation:
Pernicious anemia is caused by poor absorption of vitamin B12. It is often seen in patients with Crohn's disease, surgical removal of the intestines or stomach, intestinal parasites, and AIDS. The patient's understanding of the disorder is demonstrated by the statement that they need to start eating more red meat and liver. This is because vitamin B12 is mainly found in animal products.