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Sexual dimorphism in immunity and longevity among the oldest old
Dietary Limitations: Many "fad" diets focus on extreme calorie reduction, which can slow metabolism over time and lead to nutrient deficiencies
Individuals Taking Certain Medications Some drugs, like metformin or proton pump inhibitors, can interfere with B12 absorption
Do not discontinue prescribed B12 treatment without medical guidance , particularly if it has been recommended to address confirmed deficiency
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