ITCANBEDONE2013: Yes, walking is good exercise. Yes, walking will help one lose weight, although the main thing is to consume fewer calories. But even if one does not eat less, walking is still a great way to keep active.
There are several complexities to walking that most people don't consider. For example: an overweight person walking slower can actually burn more calories than a fit person walking faster. Another: taking short walks such as parking further away from a shopping center, going up steps instead of using an elevator, and walking down town to pay bills can in a course of a week's time burn more calories than a person realizes. Third: Eventually, if a person does HIIT walking, slowing-increasing-slowing walking speed in the course of a walk, he/she will burn more calories and increase the value of the cardio.
In answer to your question of "Is walking enough exercise?" The answer is a resounding "Yes!" You didn't ask "Should a person do more exercise than just walking?" So just keep walking and live healthy! Kudos!
"If any thing is sacred the human body is sacred...Have you seen the fool that corrupted his own live body? or the fool that corrupted her own live body? " -- Whitman
“Trust thyself: every heart vibrates to that iron string.” -- Emerson
"It's not what you look at that matters, it's what you see." -- Thoreau
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