You may have seen this before, but Crabby hadn't. It's by Joy Nash. The clip is a bit long, but well worth it. (Crabby has not tried to post a YouTube clip yet, so please bear with her if site weirdness results. She tried to do it two different ways, so there's a chance it will appear twice, or she'll only get part of it. If so, necessary adjustments will be made).
Crabby found this clip courtesy of DietBlog, yet another more informative health and fitness site than her own.