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Several studies have suggested that vitamin B12 deficiency is more common in obese individuals. We evaluated the cross-sectional associations of serum vitamin B12 concentrations with obesity in a nationally representative sample of adults in the United States.   Methods:  We included 9,075 participants aged ≥20 years in the National Health and Nutrition Examination Survey 2011–2014. Serum vitamin B12 concentrations were measured by electrochemiluminescence immunoassay. Obesity was defined as BMI ≥30 kg/m 2 . We used logistic regression with sample weights to estimate the odds ratios (ORs) and 95% confidence intervals (CIs).   Results:  Serum vitamin B12 concentrations were lower among obese adults compared with non-obese adults. After adjustment for age, gender, race/ethnicity, socioeconomic status, dietary and lifestyle factors, use of medications that could affect the serum vitamin B12 levels, dietary supplement use and fasting time, the multivariable-adjusted ORs (95% CIs) of obesity were 1.00 (reference), 0.95 (0.79, 1.14), 0.86 (0.74, 0.99), and 0.71 (0.60, 0.84) ( p  for trend <0.001) for increasing quartiles of serum vitamin B12 concentrations.   Conclusions:  In a large nationally representative sample of U.S. adults, higher serum vitamin B12 levels were inversely associated with obesity. Further investigation is needed to understand the underlying mechanisms.

Inverse Association Between Serum Vitamin B12 Concentration and Obesity Among Adults in the United States