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.
It is not necessary to cut vegetables into small pieces, because eating larger chunks is an activity for birds, who need enrichment and enjoy having something entertaining to do, according to Fruits and Vegetables in Bird Diets, a veterinary information handout by Dr. Rick Axelson of The Links Road Animal & Bird Clinic in Toronto, Canada.