An endocrinologist suggests whole milk is preferable to skim milk due to its nutritional benefits and impact on blood sugar. She explains that the fat removal process in skim milk eliminates fat-soluble vitamins A and D, along with flavor. While these vitamins are added back, their absorption is hindered without fat. The doctor advocates for a shift in perspective, moving away from the notion that all fat-free foods are inherently healthy, to enable better dietary choices.