If there is ONE thing I would recommend removing from your diet, it's high fructose corn syrup or corn syrup, in general. This faux sweetener is highly processed and used by many food companies for good reason - it's cheap.
The United States government subsidizes corn for farmers so many farmers plant corn. We end up with this mass amount of corn that is used in multiple ways, one of them being to sweeten food. So, what's the big deal?
For one, HFCS and corn syrup are heavily processed. Since it isn't something our bodies are naturally familiar with, people have experienced side effects when consuming it.
These side effects include:
1) Mood swings
2) Weakened immune system
4) Slower metabolism
6) Loose stool
All you have to do is look at a soda, salad dressing, ketchup, marinades, or even yogurt, and you'll see my dear nemesis listed there. It's typically the 1st or 2nd ingredient on many of these, meaning larger quantities of that specific ingredient. Those aren't the only places it'll pop up, so keep an eye on that ingredient list. Better swaps are REAL sugar, honey, molasses, and maple syrup. (Think closer to nature.)