How to start a persuasive speech about obesity?

It should get the attention of the audience and how to end it that will leave them some thought about the speech. Basically, my main goal is to persuade them to look after their health..Thanks!

*burp*

You coulds always point out the health risk associated with obesity.
"today in the united states, we have a severe problem with fat people..."

on second thought, maybe not quite like that...
good luck...
Use the headlines you've seen in the 'papers to begin, maybe "Obesity linked to heart disease and early death", sensational but a good way to get people listening. At the end, a positive conclusion like "exercise and better eating cures", something like that, to cheer people up and make them understand that there is a way out.