A dermatologist explains that clean eating alone may not lead to glowing skin because the body's ability to utilize nutrients is crucial. Dr. Lica Ecaterina highlights that preparation and consumption methods significantly impact nutrient absorption. For instance, toasting pumpkin seeds enhances iron and zinc availability, rinsing and resting quinoa aids protein absorption, and preparing black sesame seeds properly improves digestibility and nutrient uptake, suggesting that how food is eaten matters as much as what is eaten.