The topic of "risks involved in speedy weight loss" is important in itself. If you're thinking about a crash diet, please take the time to read my analysis of what Mayor Ford is risking.
However, this blog is about writing! So, on to the "local angle"...once we get past the "before" picture.
Local Angles for Your Writing
Using a local "angle" on a universal truth can help make it more real for your audience. A story about a hypothetical situation is far less compelling than one about a real victim. In this case, we have a locally famous real person, who is not yet, and hopefully will not be, a victim.
On a personal level, I found myself thinking about Mayor Ford's weight loss announcement for several days. Normally I might not pay much attention to his actions; but when I realized this had caught my attention, I decided to follow my interest and write the blog post.
Finally, I also recently joined an online semi-social bookmark site called Zoom It., which is dedicated to Canadian content. An article must have Canadian content, or be hosted on a clearly Canadian site, to be listed there. Many of my articles don't have that Canadian connection; but by hooking this blog post to Toronto's mayor, the article qualifies.
Yet More Shameless Self Promotion
First, pursue what you find most interesting. Yesterday, for me, it was the mayor's diet.
Second, consider using local angles for your writing. You might want to express universal truths, but it can be more effective to start with a local example or a specific instance.