The article discusses how personalized nutrition can help manage vitamin deficiencies in people who have had weight loss surgery. The researchers looked at studies on genetics, vitamins, and weight loss surgery. They found that genetic differences can affect how well the body absorbs vitamins. By using genetic testing, doctors can predict who is at risk for vitamin deficiencies after weight loss surgery. This personalized approach could be a better way to treat these deficiencies. More research is needed to fully understand how genetics can help with vitamin recommendations.