The minerals that may have physiological roles in the body but are not classified as essential nutrients due to unclear roles include:
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Vanadium: Some studies suggest it may have roles in insulin sensitivity and bone health, but these roles are not well-defined.
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Arsenic: There is research indicating potential roles in methylation and metabolic processes, but arsenic is primarily recognized as a toxic element.
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Nickel: Some evidence suggests it may play a role in certain enzyme functions, but it is not classified as essential.
Fluoride and Calcium are classified as essential nutrients due to their well-established roles in health (fluoride for dental health and calcium for bone health).
So, the correct answers are:
- Vanadium
- Arsenic
- Nickel