Final answer:
The friend is most likely deficient in (a) Iron, causing symptoms of fatigue and frequent sickness. Iron is essential for hemoglobin formation and healthy red blood cells.
Step-by-step explanation:
The friend is most likely deficient in Iron, causing her symptoms of fatigue with activity and frequent sickness. Iron is an essential mineral that plays a crucial role in the formation of hemoglobin, which carries oxygen in the red blood cells. Without enough iron, the body cannot produce enough healthy red blood cells, leading to anemia and the symptoms experienced by the friend.
It is worth noting that although the friend has cut out all meat and animal products to decrease fat intake, it is still possible to obtain sufficient iron from plant-based sources like legumes, spinach, and other dark leafy greens.
It is recommended for the friend to consult with a healthcare professional or a registered dietitian to ensure she is meeting her iron needs through a well-planned, plant-based diet or consider adding iron supplements if needed.