Did you know…

Obese patients are simultaneously overfed in calories and undernourished in essential micronutrients. The condition is not overnutrition. It is misnutrition. The most common documented deficiencies in this population are vitamin A, thiamine (B1), folate (B9), cobalamin (B12), vitamin D, iron, calcium, and magnesium. And these are measured before any bariatric surgery, in patients whose daily caloric intake is often well above requirements.

The claim, in the words of the field

The 2018 review published in International Journal of Obesity is titled with the paradox: “Overfed but undernourished: recognizing nutritional inadequacies/deficiencies in patients with overweight or obesity.” The premise the authors defend is that obesity, in the modern nutritional environment, is systematically accompanied by micronutrient inadequacy that ordinary primary care does not detect.

In pre-bariatric assessment (the population studied because the intervention forces the workup), the specific magnitudes are striking:

• Vitamin D deficiency: 42 to 74% of candidates, depending on the cohort
• Selenium deficiency: 34%
• Folate deficiency: 33.5%
• Iron deficiency: 32%
• Calcium deficiency: 13%
• Vitamin B12 deficiency: 10%

Why this ends the “calories in, calories out” frame

An adult who eats 3,000 kcal per day of ultra-processed food is not eating too much of everything. They are eating too much of caloric density and too little of everything the caloric density has displaced. A regime rich in refined carbohydrate, refined seed oil, and industrial protein is by construction a regime poor in the micronutrients that fresh whole foods carry. The paradox is not a paradox at all. It is what the biology predicts when the food environment separates energy from nutrient density.

Why the workup does not follow the person

The only population routinely screened for these deficiencies is the pre-bariatric one. An obese adult who is not on the surgical pathway typically receives an HbA1c, a lipid panel, a TSH, and a note about lifestyle. The micronutrient panel that a bariatric surgeon would order is not what the primary care visit generates. The person is diagnosed with obesity. They are not diagnosed with the eight deficiencies obesity is statistically associated with.

This entry is a companion to arguments on the workup they do not order and to the ledger as the wrong instrument.