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However, maintaining a nutrient-deficient diet during a period of intense endurance workout (whether routine or not) can lead to significant losses in lean mass and decreased sports performance , increasing the risk of exercise-related injuries
Bhasin S, et al
Muscle Spasms There are many muscles in the upper abdominal region
Conclusion Whilst severe B12 deficiency has a clear clinical picture with characteristic haematological and/or neurological features, establishing mild or borderline deficiency can be problematic as serum levels are maintained at the expense of tissue concentrations, and therefore serum levels of B12 may be in the low normal or borderline range despite a deficiency
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