Marginal biotin deficiency can be induced experimentally in humans using a cost-effective outpatient design.
Level 3 - non-randomized controlled study
Non-randomized comparative experimental trial with three parallel outpatient protocols
PubMed 22157538 · doi:10.3945/jn.111.151621
What was done
Researchers tested three 28-day outpatient protocols in humans consuming a self-selected mixed diet to evaluate whether marginal biotin deficiency could be induced without strict inpatient dietary control. Eleven participants were allocated across three designs: design 1 (n = 4; 3 women) received oral avidin capsules at 7 times estimated dietary biotin intake; design 2 (n = 2; 2 women) received avidin capsules at 14 times estimated intake; and design 3 (n = 5; 3 women) consumed undenatured egg-white beverages at 7 times estimated intake. Biotin status was assessed via lymphocyte propionyl-CoA carboxylase activity, urinary excretion of 3-hydroxyisovaleric acid, 3-hydroxyisovaleryl carnitine (3HIA-carnitine), and biotin, as well as plasma 3HIA-carnitine.
What was found
The abstract reports no numerical values, baseline measurements, or statistical significance levels. It reports qualitatively that designs 1 and 2 (capsules) failed to induce marginal biotin deficiency, whereas design 3 (egg-white beverage) was effective in altering the measured indices of biotin status to a degree comparable to prior inpatient studies.
Why it matters
This establishes a less expensive, outpatient method for experimentally inducing marginal biotin deficiency using egg-white beverages, avoiding the high cost and burden of inpatient dietary studies.
Limits
The total sample size was extremely small (n = 11 total: 4, 2, and 5 per group) and heavily female (8 of 11 participants). The study was non-randomized, relied on self-selected diets with estimated intake, and the abstract omitted all numerical data and effect sizes.
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