3. Vitamin D
Vitamin D is truly a versatile nutrient in that it benefits pretty much every area of your entire body. Fortunately for you, sardines contain high levels of vitamin D just like tuna — except without all the contaminants that you’d normally consume. First of all, vitamin D is very effective at regulating the natural insulin levels in the body making it very beneficial for diabetics who often struggle with this very issue.
Many people suffering from diabetes eat a lot of sardines to keep their insulin levels stable and avoid hypoglycemia. Your bones and teeth will also be more efficient at absorbing calcium from the food that you eat when you take in enough vitamin D along with it. Furthermore, there have been many studies showing that vitamin D can improve the health of your lungs, heart, brain, and immune system — providing full coverage.