270 lb man in diapers 5. March 2011 William Davis (20) Alex is a big guy: 6 ft 4 inches, 273 lbs. On 10,000 units per day of vitamin D in gelcap form, his 25-hydroxy vitamin D level was 38.4 ng/ml. One year earlier, his 25-hydroxy vitamin D level, prior to any vitamin D supplementation was 9.8 ng/ml. According to the latest assessment offered by the Institute of Medicine (IOM):Vitamin D need for a 13-month old infant: 600 units per dayVitamin D need for a 6 ft 4 in, 273 lb male: 600 units per dayI paint this picture to highlight some of the absurdity built into the smug assumptions of the IOM's report. It would be like trying to fit a large, full-grown man into the diapers of a 13-month old. Few nutrients or hormones (in fact, I can't think of a single one) are required in similar quantity by an infant or toddler and a full grown adult. However, according to the IOM's logic, their vitamin D needs are identical, regardless of age, body size, skin color, genetics, etc. One size fits all.Just as the original RDA assessment by the Institute of Medicine kept thinking about vitamin D somewhere in the Stone Age, so does this most recent assessment.