Okay, lets amend the serving size arguement to “if its a bulk food, they can determine the serving size”. But if its a package size that could EASILY be construed as a single serving (I’m thinking poptarts since we were talking about it the other day at work) because the package isn’t easily resealable…that’s a serving. Not two. Or (I’ve seen this somewhere…where I can’t recall) amount per serving and amount per package. That would suffice.
What I’d really like to see is doing away with all the “official looking seals that mean crapola”. For the most part, I’m a label reader and tend to “know better” but that doesn’t mean it isn’t bordering on false advertising!

Can we have real allergen warnings? “Contains” statements are great, but “may contain”? “Processed on equipment with”? “processed in a facility with”? These are generic CYA statements!!! I get the number off the box, call the company, find out their procedures for whatever I need information about for cross contamination and then go back to the store. If you do not make your product in the same building with peanuts, WHY put the “made in a facility with” warning on. It’s not a law to put it on there, it’s confusing to people, it makes people avoid your product, and I realize you’re doing it to all the boxes just to make it “easier” on yourself, but STOP!!! I want to see real, facutal allergen information, not CYA statements that might not be accurate and lead me to not buy your food.

I agree with GP about the serving size thing. I more frequently eat one serving of cereal or pasta than I eat the whole package of anything. If I eat 2 servings, that’s still easier math than figuring out what fraction of the package I’ve eaten. I also agree with PlumbLucky that some things appear to be single servings, but aren’t. For example, there are microwavable soups that my husband takes to work for lunch. You heat it and eat it right out of the bowl. I can’t imagine that anyone would save half for later, and I don’t know why they even need to pretend it’s lower calorie than it is when it’s only 100 cal for the whole thing. It’s weird.
Most of the food we eat doesn’t come with labels, and if we’re eating at home I make things from scratch. When I make soup, I don’t know how many calories I end up eating, but I sort of wish I could be better at estimating.

How about this: if the package can be resealed and stored without seriously affecting the product, the manufacturer can decide the serving size, but any claims on the front, like “Only 100 calories” must contain the serving size— “Only 100 calories per 1/4 cup” in equal size font to the claim. And anything that cannot be resealed is one serving. A can of soda is one serving, a silver package with two pop-tarts is one serving, etc. I don’t think it would work at all to put the calorie content for an entire package of pasta or cereal—can you imagine the heart attack people would have at a bulk-size box of spaghetti and its thousands of calories?