Corn syrup -- it's absolutely everywhere. And it may be making you fat.

Here's why: High-fructose corn syrup (HFCS), used to sweeten everything from the obvious (soft drinks) to the obscure (ketchup, salad dressing, bread), can trip up digestive system hormones that control hunger and appetite. The end result: Your brain misses out on hormone messages that signal a full stomach. Start reading labels and see if you can cut back on the 63 pounds of HFCS most people consume each year.

Your digestive system has two main hormones that control hunger and appetite. Ghrelin is secreted by the stomach and increases your appetite. When your stomach's empty, it sends ghrelin out, requesting food. Leptin tells your brain that you're full. HFCS inhibits leptin secretion, so you never get the message that you're full. And HFCS never shuts off ghrelin, so even though you have food in your stomach, you constantly get the message that you're hungry.

That's the physiology behind a theory gaining a lot of ground -- the theory that our increasing consumption of HFCS is one of many elements at play in America's obesity epidemic.

Because it's cheaper than sugar, HFCS is used to sweeten many processed foods and beverages. And although manufacturers may eliminate fat from their products, they make up for its taste with sugar and HFCS. Which means that cutting down on processed foods and sweetened drinks -- even the fat-free kind -- is a good way to reduce your intake.