I don't eat French Fries for health though I don't know what is unhealthy about potatoes and fat is not inherently bad unless you're fat. I'm not and can use the extra calories.
I'm not sure what you mean by real cheese. It's there, I can see it, I can taste it, and I've never eaten plastic so I can't really comment on that but I don't think I can chew and digest plastic.
Most fast food restaurants use pasteurized process cheese product instead of actual cheese.
It’s more than 50% actual cheese, with the rest being fillers.
It looks like cheese, behaves like cheese, and mostly tastes like cheese. I don’t believe it tastes
anything like plastic (and it contains no plastic), but I prefer my burgers without it.