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The back of the box is not advertising — it is a legal document, and it has to tell you the truth. The front of the box is advertising, and some of its favourite words mean nothing at all.
Pick up any packaged food in an American shop and you are holding two things at once.
The front was designed by people whose job is to make you pick it up. The back was designed by lawyers, because the government sets rules about exactly what has to appear there and in what order.
Once you know three of those rules, the back of a box stops being small grey print and starts being genuinely useful. Here they are.
The ingredient list is not alphabetical and it is not the order somebody typed them in. US law requires ingredients to be listed in descending order of predominance by weight — heaviest first, lightest last.
That one sentence turns the list into information. If the first word is water, there is more water in there than anything else. If a word you were excited about sits second from the end, there is very little of it.
Position on the ingredient list tells you how much — not exactly, but in order. First means most.
There is one exception worth knowing, and it is written into the rule itself: ingredients that make up 2% or less of the food can be bunched together at the very end, under a line like contains 2% or less of…, and inside that bunch the order stops meaning anything. So the ordering is reliable right up until you reach that phrase.
Read the rule again slowly. It orders each ingredient separately, by its own weight.
So picture a food sweetened three different ways — some cane sugar, some corn syrup, some honey. Each one is a separate ingredient, so each one is weighed on its own, and each separate entry weighs less than all three added together. Three smaller entries can sit further down the list than one big entry would have.
Nothing there is a lie. Every word on that label is accurate. It is just that a reader who only looks at the first ingredient is answering a different question than the one they thought they asked.
This is the general shape of almost everything on a package: not false statements, but true statements arranged carefully. Reading a label well is mostly the habit of asking what a true statement is quietly leaving out.
A fruit drink's ingredient list reads: Water, Sugar, Apple juice concentrate, Natural flavour, Citric acid. What do you actually know?
The calories, the sugar, the salt — none of those numbers describe the package. They describe one serving, and one serving is often not the amount a person eats.
Here is how a serving size gets chosen. The FDA publishes a list of reference amounts — how much of each kind of food people really eat at one sitting, worked out from national eating surveys. A maker has to set the label serving close to that reference amount. So they cannot simply invent a tiny serving to make the numbers look small.
But nobody sets how much goes in the packet. That is where the surprise lives, and it has a name printed right above the calories: servings per container.
The rules moved in the reader's favour in 2016. The reference amount for ice cream went from half a cup to two-thirds, because that is closer to what people actually scoop. And a package holding between one and two servings — a 20-ounce bottle of soda, say — now has to be labelled as a single serving, because that is how it gets drunk.
Still: before you read a single number on the panel, look at the two lines above it.
Imagine a bag of crisps. The panel says 150 calories, and just above that, 3 servings per container. Press through what happens as somebody eats it in front of the television.
Two snack bags sit side by side. Bag A says 150 calories, 3 servings per container. Bag B says 200 calories, 1 serving per container. Which bag has more calories in it?
Front-of-pack words fall into two piles. Some have an actual number behind them that a company must hit or it is breaking the law. Others sound just as official and mean whatever the marketing team wanted them to mean. Sort each one and read what it really requires.
Tap an item, then tap where it belongs
A cereal box says NATURAL in big letters across the front. What has the company promised you?
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Ingredient order: 21 CFR 101.4 requires ingredients to be listed by common or usual name in descending order of predominance by weight; ingredients present at 2 percent or less may be grouped at the end after a quantifying statement, where order no longer signifies. Serving size: 21 CFR 101.12 sets Reference Amounts Customarily Consumed (RACCs), derived from national food-consumption survey data (the 2016 update used NHANES 2003-2008). Label serving sizes must be based on those reference amounts, not chosen freely. FDA final rule on serving sizes, published in the Federal Register 27 May 2016: raised the ice cream reference amount from 1/2 cup to 2/3 cup, and requires packages containing between one and two reference amounts (e.g. a 20 fl oz soda) to be labelled as a single serving. Nutrient content claims (21 CFR part 101, subpart D): 'low fat' means 3 g of fat or less per serving; 'good source' means 10-19% of the Daily Value per serving; 'high'/'excellent source' means 20% or more. 'Gluten-free' requires less than 20 ppm gluten under FDA's gluten-free labelling rule. 'Natural': the FDA has not established a formal definition for the term in food labelling; it maintains only a long-standing non-binding policy that nothing artificial or synthetic has been added that would not normally be expected in the food, and that policy expressly does not address production or processing methods. 'Farm fresh' and 'wholesome' have no FDA definition. The crisp-bag example (150 calories, 3 servings) is an illustration, not a real product.