
Preteens are known for their defiant attitudes and dramatic mood swings, but over the last decade a much more disturbing characteristic has been increasing: depression.
A new study finds that one culprit may be a high fast-food, low plant-based diet. When researchers at the University of Alabama at Birmingham analyzed urine from a group of middle schoolers, they found high levels of sodium and low levels of potassium.
"High sodium, you've got to think of highly processed food," said lead author Sylvie Mrug, chair of the psychology department at UAB. "This includes fast food, frozen meals and unhealthy snacks."
Low potassium, Mrug added, is an indication of a diet that lacks healthy fruits and vegetables that are rich in potassium, such as beans, sweet potatoes, spinach, tomatoes, bananas, oranges, avocados, yogurt and even salmon.
The study also found that higher urine levels of sodium, and potassium at baseline, predicted more signs of depression a year and a half later, even after adjusting for variables such as blood pressure, weight, age and sex.










