Dr. Rhonda Patrick on health: what the evidence says · JRE #1474
SUBJECT: HEALTH
Not a true/false call. Every claim is logged with its sources; read the exhibits below.
Obese people are like three times more likely to be vitamin D deficient in the United States.
What the evidence says 01 / RECORD
Patrick claimed obese people are roughly three times more likely to be vitamin D deficient than non-obese people. It is well established that obesity is associated with lower circulating 25-hydroxyvitamin D levels, largely because vitamin D, a fat-soluble compound, is sequestered in larger adipose tissue stores. However, the leading systematic review and meta-analysis on this topic (Pereira-Santos et al., 2015, pooling 23 observational studies) found the prevalence of vitamin D deficiency was 35% higher in obese individuals compared with normal-weight individuals (prevalence ratio 1.35, 95% CI 1.21-1.50), and 24% higher than in overweight individuals, not three times higher. The NIH Office of Dietary Supplements likewise describes people with obesity as a group at elevated risk of vitamin D inadequacy, without citing a threefold figure. Some individual studies using odds ratios rather than prevalence ratios, or specific subpopulations (e.g., severely obese bariatric-surgery candidates), report larger relative differences, but the commonly cited pooled effect size in the literature is approximately 1.2 to 1.5 times, not 3 times. The claim reflects a real and evidence-supported association but substantially overstates its magnitude.