You don’t need to read the entire label to know whether a packaged product is a good choice. Instead, you just need to look at three things, in this order: the ingredient list, the serving size, and the sugars. That alone will settle 90% of the decisions you make standing in front of the supermarket shelf.
Why Labels Are Designed to Confuse You
Every package has two faces. One side is advertising: «natural,» «whole grain,» «source of fiber,» «no added sugar,» «0% fat.» The other side, however, holds the real information: the ingredient list and the nutrition facts table.
In other words, the front is designed to sell you the product, while the back is what actually tells the truth.
Yet almost nobody knows how to read that back side, and that’s exactly where the decisions that actually matter get made. As a result, a large part of the sugar we eat today ends up hidden in products that don’t even taste sweet: sauces, sandwich bread, boxed cereal, salad dressings.
So, this guide will teach you how to read a label in under 30 seconds, no nutritionist degree required.
The 3 Things to Check Before Anything Else
1. The ingredient list. Ingredients are listed from highest to lowest quantity, so if sugar shows up among the first three, you already know what that product is mostly made of, no matter what the front of the package claims.
2. The serving size. Every number you see in the nutrition facts table refers to that specific serving, not the whole package — which is, by far, the point where most people get tripped up.
3. The sugars, especially added sugars, when the label lists them separately from the total.
Overall, if you apply just this much, you’re already making better decisions than most people in that aisle.
The quick 5-ingredient rule: it’s not an official law, but it works remarkably well as a filter. For example, if the list has more than five ingredients and several of them aren’t things you’d recognize as food from your own kitchen, you’re probably looking at an ultra-processed product.
The Serving Size Trick, Where Almost Everyone Gets Fooled
This is the most deceptive part of the label, and that’s no accident: it benefits brands for you to see «low calories» without stopping to think about how much you’re actually going to eat.
For instance, a bag of cookies might list 120 calories and 8 grams of sugar. Sounds reasonable at first glance. But if you read the line above it, it says «serving size: 3 cookies,» and the bag contains twelve. So if you eat the whole bag — which happens to pretty much everyone in front of the TV — you just consumed four times those numbers.
Here’s how to avoid falling into that trap:
- Always look for the «serving size» and «servings per container» lines first, before checking any other number.
- Then, mentally multiply by the number of servings you’re actually going to eat, not by what the package says you «should» eat.
- Finally, when comparing two products, always use the «per 100 g» or «per 100 ml» column, since brands intentionally vary their declared serving sizes to make the comparison harder.
Total Sugars vs. Added Sugars: They’re Not the Same Thing
Total sugars: include both the sugars naturally present in the food (like those in milk or fruit) and the ones added by the manufacturer.
Added or free sugars: these are the ones the manufacturer puts in during processing. The World Health Organization recommends keeping them under 10% of daily energy intake, and notes that dropping below 5% brings additional health benefits. Specifically, on a reference 2,000-calorie diet, that 5% works out to roughly 25 grams — about six teaspoons.
To put that in perspective: a single can of soda can come close to that entire recommended daily amount on its own.
Plain yogurt with no added sugar will still show total sugars on its label — the ones naturally present in milk — even though nothing was added to it. That’s why the ingredient list is more reliable than the number alone: if sugar doesn’t appear among the ingredients, the sugars you see are naturally occurring, not an extra you need to watch out for.
The Names Sugar Hides Behind
A very common industry trick is splitting sugar across several different ingredients so that none of them individually rank near the top of the list, even though combined they make up the bulk of the product.
For example, all of these names are, in essence, sugar:
- Inverted sugar
- Corn syrup
- High-fructose corn syrup
- Dextrose
- Maltodextrin
- Sucrose
- Fructose
- Glucose
- Maltose
- Agave syrup
- Honey
- Molasses
- Cane sugar
- Concentrated fruit juice
- Panela (unrefined cane sugar)
- Dextrin
- Rice syrup
- Brown sugar
Warning sign: if you spot three or four of these names in the same product, combined they almost certainly add up to more than the very first ingredient on the list.
What the Warning Octagons Mean
Peru, Chile, Mexico, and other countries in the region use a front-of-package warning system that does a lot of the work for you: the black octagons.
Specifically, these went into effect in Peru on June 17, 2019, under Law 30021 on the Promotion of Healthy Eating, and appear in the upper-right corner of the front of the package. There are four:
| Octagon | What It Means |
|---|---|
| High in sugar | The product exceeds the established sugar threshold |
| High in sodium | Exceeds the salt threshold |
| High in saturated fat | Exceeds the saturated fat threshold |
| Contains trans fats | A specific warning, with the wording «avoid consumption» |
According to Peru’s Ministry of Health, the official thresholds for the sugar octagon are 22.5 g or more per 100 g in solid foods, and 6 g or more per 100 ml in beverages.
How to use them properly:
- Even so, a product with no octagons isn’t automatically healthy. It can still be ultra-processed — it simply doesn’t cross those specific thresholds.
- Likewise, a product with an octagon isn’t banned or «poison.» It’s simply telling you there’s a notable excess of something to factor into your overall eating habits.
- In practice, the most useful approach is comparing two products of the same type and picking the one with fewer warnings.
Marketing Claims That Don’t Mean What You Think
- «No added sugar»: they didn’t add sugar during processing, but the product may still contain natural sugars or sweeteners that serve a similar function.
- «Light» or «reduced»: means a reduction compared to the original product, not that it’s healthy on its own. In fact, fat often gets removed and sugar gets added to compensate, or vice versa.
- «Whole grain»: check that «whole wheat flour» or «whole grain» actually appears as the first ingredient on the list, since many breads are, in reality, refined flour with a bit of added bran just to justify the label.
- «Natural»: doesn’t have a strict definition under most regulations, so on its own it guarantees nothing.
- «Source of fiber» or «with vitamins»: can be perfectly true and, at the same time, describe a product that’s also loaded with sugar — one doesn’t rule out the other.
Reading a Label in 30 Seconds
- First, look at the front: are there octagons? How many?
- Then flip it over and read the first three ingredients.
- Next, check how many ingredients there are in total.
- After that, find the serving size and multiply it by what you’re actually going to eat.
- Finally, if comparing products, use the «per 100 g» or «per 100 ml» column to put both on equal footing.
With those five steps, you’re already making better decisions than most people standing in that same aisle.
Key Takeaways
- In short, the front of the package sells; the back informs.
- Ingredients are listed from highest to lowest quantity — the first three tell you almost everything about the product.
- Serving size is the single most common trap on the entire label.
- Sugar hides under dozens of different names, deliberately split up.
- Warning octagons help, but their absence doesn’t guarantee a product is healthy.
- Above all, to compare products against each other, always use the per-100 g or per-100 ml column.
Frequently Asked Questions
Is a product with no octagons healthy? Not necessarily. It only means it doesn’t exceed the established thresholds for sugar, sodium, or saturated fat, so it can still be ultra-processed with other nutritional issues.
Which matters more, the nutrition facts table or the ingredient list? Generally, the ingredient list matters more in most cases, since it tells you what the product is actually made of, while the nutrition table tells you how much of each thing it contains.
Are sweeteners better than sugar? It’s a topic still under debate, and recommendations have shifted over time. Either way, a product containing sweeteners doesn’t automatically become a healthy food just because of that.
How do I compare two products from different brands? Always use the «per 100 g» or «per 100 ml» column, since it’s the only common ground — each brand reports whatever serving size works best in its favor.