Final answer:
Pernicious anemia, caused by vitamin B12 deficiency, commonly results in feelings of weakness or tiredness and poor concentration. This condition stems from inadequate oxygen delivery to tissues due to reduced red blood cell production. Adequate intake of vitamin B12 and folate through diet or supplements is crucial for prevention.
Step-by-step explanation:
Vitamin B12 deficiency is known as pernicious anemia and is characterized by several symptoms. Two key symptoms include feelings of weakness or tiredness and difficulties with concentration. This type of anemia results in fewer red blood cells being produced than normal, meaning that tissues and organs do not get enough oxygen, which can lead to these symptoms. Additionally, pernicious anemia affects the nerves and can result in symptoms like numbness or tingling in the hands and feet.
Individuals at risk include those with Crohn's disease, those who have undergone surgical removal of parts of the intestines or stomach, and people with certain intestinal parasites or AIDS. Teens, children, vegans, and vegetarians can be especially susceptible due to dietary insufficiencies. It's essential to consume sufficient amounts of vitamin B12 and folate either through diet or supplements to prevent this type of anemia.