Iron deficiency, affecting over 30% globally, can lead to tiredness and headaches. Ferritin levels below 15 μg/L signal low iron stores, causing anaemia. Women, especially those who menstruate, are at higher risk. 18-29-year-old women have 27% lower ferritin levels. Red meat is a good iron source, while vegetarians and vegans can balance their diet with iron-rich plant foods. Symptoms of low ferritin include fatigue and pale skin. Regular ferritin tests can help maintain well-being.