Dr. John McDougall lists a few of the benefits associated with walking regularly in his article: "Achieve 100% Health with Exercise"

"Although dietary changes will take you a long way to being completely healthy, you will need some exercise to improve your fitness and well being. Exercise, as simple as a daily walk, can benefit you."

You will experience:

More appropriate appetite
An increase in muscle tissues, and thus a better ratio of lean body tissue to fat
Loss of excess weight
Improved muscle tone and flexibility
More energy, less fatigue
Some improvement in circulatory system
Improved digestion
Better mood - including less depression and anxiety
A fall in blood pressure
Lower triglyceride and blood sugar levels
Higher HDL ("good") cholesterol level