This video is from Dr. Balduzzi, founder of the Fit Father Project and The Fit Mother Project. He discusses the importance of walking and the many overall health benefits of walking each day. He also discusses the best time of day to walk; in the morning and again after eating a meal (typically dinner).
This supports a recent article on myNutritionFitness, Walking is great for weight loss and so much more that talks about the cardiovascular benefits of walking as well as walking helps protect you from dementia, peripheral artery disease, diabetes, depression, reduces risk for breast and colon cancer, eases joint pain, and even boosts immune function.
As always consult your doctor before beginning any exercise program, and if you doctor agrees, check with him or her to determine a good starting point for you.