People who notice their skin turning lighter, along with other symptoms, should see a doctor as soon as possible. It could prevent a serious issue that makes people more likely to get sick or struggle with heart or lung complications. Speaking on TikTok , naturopathic doctor Dr Mac Toohey explained how a lack of a single vital mineral can manifest as clear physical warning signs. The medic claimed that a "telltale sign" of iron deficiency can sometimes be spotted a mile away - and it's down to