Looks like it contains vast amounts (~30% of the calories in an alleged meat product) of potato starch. How does that work metabolically? If it turns into fructose in the body, we're right back where we started with the sugars...

Starch is a whole bunch of glucose molecules chained together. No fructose.

I wasn't talking about their nuggets — although, there are a few facts you ought to know: One, the FDA allows you to report nutritional categories at 0g if there is .9g or less per serving. A lot of "low carb" foods push this ruling to its limits.

Second, I wasn't able to find the page for nuggets specifically, but I doubt their preparation of the chicken meat in nuggets is better than their non-breaded, grilled breast filets:

Grilled Chicken Fillet Allergens: SOY LECITHIN Chicken breast fillet with rib meat, water, seasoning (rice starch, salt, sugar, yeast extract, canola oil, onion powder, maltodextrin, chicken skin, paprika, flavor, sunflower oil, chicken, garlic powder, chicken fat, spices), sodium phosphates.

Prepared with Liquid Margarine: Liquid soybean oil and hydrogenated cottonseed and soybean oils, water, partially hydrogenated soybean oil, salt, soy lecithin, mono-and diglycerides, sodium benzoate and potassium sorbate (preservatives), artificial flavor, citric acid, vitamin A palmitate, beta carotene (color).

CONTAINS: SOY LECITHIN.

SOURCE: http://www.mcdonalds.com/getnutrition/itemDetailInfo.do?item...

Maltodextrin isn't HFCS but it is a (no doubt corn-)derived sugar. And I highly doubt even most reasonable people would look at a plain grilled chicken patty and assume it has 18 ingredients, including TWO types of sugar (and possibly three — "flavor" is enigmatically opaque).