Wow, I would love to give that speech.

A lot of good research is available at atkins.com. Check out The Science Behind Atkins, especially the Fact vs. Fallacy articles. A good help especially if you will have to engage in debate. Here's a good reference list for the principles:Principles for Weight Loss

Studies are VERY convincing, so referring to them will strengthen your argument. I will come back if I can find a visual aid. It's a little more complicated than a visual aid might be able to illustrate though. Hmm.

Ok, I found one but it's scientific... might not help. Links to Glycolysis and Lipolysis Metabolism Diagrams

Good luck on your speech!