I love all of the consumption fads.
1. If you eat wheat, corn, or any other grain, you are eating a GMO product that has been GMO'd for hundreds of years.
2. MSG occurs naturally (sometimes in very high concentrations) in tomatoes, mushrooms, hard cheeses, and millions of other foods.
3. Carrageenan is a polysaccharide from seaweed used to clarify the haze in a beer during the brewing process. In most cases powdered flakes are used. Particulates attach to the substance like a magnet and are more easily filtered out.
4. The level of fructose used (HFCS or otherwise) is meaningless since the majority of it is converted to alcohol.
There is nothing more unhealthy in a beer than the alcohol itself. Not all the sugars are converted into ethanol. There is also methanol and several other alcohols that form as a result of the breakdown of cellulose and other components in the wheat/corn/rice, besides just starch. Commonly called "wood alcohol," those components represent far more of a health risk to you than corn that was bread to resist smut.
This is kind of like focusing on the health risks of the paper used to roll cigarettes.