Few things are better for us or more difficult to sustain than losing weight. Whatever the cause--genetics, environment, our own bad choices--human bodies can be easily turned into sugar-craving machines. Turning our bodies from that course is easy enough for a week or three, but sustaining weight loss over many months and years is notoriously difficult.

No one knows this better than scientists and researchers, which is why so much effort over the years has gone into developing weight loss drugs and treatments. After all, if a simple pill could melt the pounds away, we might not have to deal with the excruciating difficulty of changing our habits. But what if that elusive weight-loss pill wasn't a pill after all, but a spray? And what if the active ingredient of the drug wasn't something created entirely in a laboratory, but instead a naturally occurring substance?