In recent years, experts have discovered more far-reaching effects of vitamin D deficiency. In 2009, researchers from the University of Missouri-Columbia found that insufficient levels of vitamin D are associated with inflammation, an immune system response that can cause fluid buildup and swelling.
1 of 19 Facebook Pinterest. Feeding birds comes naturally when you grow trees and shrubs with nutritious berries. The plants you'll find in this slideshow do double duty: They attract birds and create a beautiful display with their flowers, fall colors, and fruits adding sparkle to your landscape. 2 of 19 Facebook Pinterest.
Ingrid Taylar. Birds do not chew or digest the same way as humans or more familiar animals. Understanding birds' different digestive organs and how they eat, however, can help birders be more knowledgeable about the best foods for birds and why a healthy diet is important for every bird.