I didn't know when I collapsed at work

TL;DR

Vitamin D deficiency is increasing in the UK, particularly among girls and young women.
Low vitamin D levels can cause fatigue, dizziness, heart palpitations, and bone pain, potentially leading to conditions like osteomalacia.
Sunlight is the primary source of vitamin D, but factors like climate, lifestyle, and skin tone affect production.
Doctors do not routinely test for vitamin D deficiency, and symptoms can be easily missed or misdiagnosed.
Experts are calling for a raised threshold for classifying vitamin D deficiency and wider food fortification policies, similar to those in Canada and Sweden.

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