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On the other hand, a vitamin B12 deficiency appears to cause a loss of appetite in some people, leading to weight loss rather than weight gain ( That said, the current evidence is too weak to suggest that a vitamin B12 deficiency has any strong or specific impact on weight be it weight gain or loss

Caregivers often notice small physical or behavioral changes before blood tests confirm the problem

In athletic performance, mitochondrial efficiency directly influences endurance, recovery speed, and overall work capacity

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