How to read a label in ten seconds

Turn the package to the ingredient list and look for one thing a home kitchen doesn’t keep. That’s a sugar like high-fructose corn syrup, dextrose or maltodextrin, a protein like whey or soy protein isolate, a hydrogenated oil, or a flavor, color, gum, emulsifier or sweetener. One is enough. Then check the Nutrition Facts for fiber, protein and added sugar.

Why the front of the box misleads

The front of a package is advertising. It shows a field of wheat, a bowl of berries, a word like “wholesome”. The back is the law. US food labels have to list every ingredient by its common name, in order of how much of it is in the food by weight, under the FDA’s rule at 21 CFR 101.4.

That rule gives you two shortcuts. The first few ingredients make up most of the food. And the rule lets companies put anything at 2% of the weight or less at the end, after a line like “Contains 2% or less of”, in any order. That tail is often where the flavors, colors and emulsifiers sit.

The ten-second scan

1. Find the ingredient list. It’s under or beside the Nutrition Facts panel, starting with “Ingredients:”.
2. Read the first five items. NOVA’s 2019 guide says the substances kitchens don’t use, like high-fructose corn syrup, maltodextrin or a protein isolate, usually sit at the start or the middle.
3. Jump to the end. The same guide says flavors, colors, emulsifiers, sweeteners and other cosmetic additives tend to come at the end of the list.
4. Stop at the first marker. One is enough to put the food in group 4. If you find none, it’s group 3 when salt, sugar or oil was added, and group 1 when nothing was.
5. Flip to the Nutrition Facts. Compare added sugars, fiber and protein with the other version on the shelf. Sodium too, if you’re watching your blood pressure.

What the markers look like

Every class in the table comes from NOVA’s own list. The label checker knows about 190 ingredients, with their other spellings, and lights up the markers in your own text without sending it anywhere.

The sugar names

The 2025 to 2030 Dietary Guidelines say to treat any ingredient with “sugar” or “syrup” in its name, or ending in “-ose”, as added sugar. They list high-fructose corn syrup, agave syrup, corn syrup, rice syrup, fructose, glucose, dextrose, sucrose, cane sugar, beet sugar, turbinado sugar, maltose, lactose, fruit juice concentrate, honey and molasses.

Only some of those are NOVA markers. Table sugar, cane sugar, honey and molasses are kitchen ingredients, so a granola sweetened with honey can stay group 3. High-fructose corn syrup, dextrose, fructose, lactose, invert sugar and fruit juice concentrate are markers, so one of them makes a food group 4. For your health, the grams of added sugar on the Nutrition Facts panel tell you more than the name, whichever it is. The guidelines say one meal should have no more than 10 grams of added sugar.

“Organic” and “natural”

Neither word changes the group. NOVA looks at what’s in the food, and how it was farmed doesn’t enter into it.

The USDA’s list of non-farm ingredients allowed in organic food, at 7 CFR 205.605, includes carrageenan, xanthan gum, the high-acyl form of gellan gum, and flavors, as long as they come from natural sources. An organic granola bar with “natural flavors” or an organic chocolate milk with carrageenan is group 4. Whatever “natural” on the front of a box is meant to say, “natural flavor” in the ingredient list is itself a marker. The organic myth has more.

Preservatives

Preservatives on their own don’t make a food ultra-processed. NOVA’s guide says additives that keep food from spoiling can be used in processed foods too, so a loaf with calcium propionate doesn’t cross the line on that alone.

The Dietary Guidelines still say to limit foods with artificial preservatives, along with artificial flavors, petroleum-based dyes and low-calorie sweeteners. The label checker shows preservatives in a lighter color, so you can see them without mistaking them for markers.

Hydrogenated oils

You won’t see “partially hydrogenated oil” on a new US label. The FDA ruled in 2015 that these oils, the main source of artificial trans fat, were no longer generally recognized as safe, companies mostly couldn’t add them after June 18, 2018, and the last deadline passed on January 1, 2021.

“Fully hydrogenated oil” is a different ingredient, and you’ll still see it, for example in peanut butter made so the oil never separates, and it’s still a NOVA marker, so a peanut butter with it is group 4, and one of peanuts and salt is group 3.

Long names that aren’t markers

A chemical-sounding name isn’t a test. Ascorbic acid is vitamin C. Added vitamins and minerals like folic acid and iron aren’t on NOVA’s marker lists, and neither are preservatives like calcium propionate. “Natural flavor” sounds friendly and is a marker. The test is NOVA’s list, and the length of a word tells you nothing.

Salt on the label

Salt is a kitchen ingredient, so it never makes a food group 4. The Nutrition Facts panel gives the sodium in each serving, though, and if you’re watching your blood pressure, that number tells you more than the group. Why does salt raise blood pressure? on bloodpressure.guide explains it.

Practice on three labels

These lists are examples written to show how the test works, not copied from any one product.

• Sliced whole wheat bread: whole wheat flour, water, wheat gluten, sugar, yeast, soybean oil, salt, molasses, preservatives (calcium propionate, sorbic acid), monoglycerides, soy lecithin. Group 4. The first marker is wheat gluten, third on the list, and the monoglycerides and soy lecithin at the end are emulsifiers.
• Tomato-flavored chips: potatoes, vegetable oil, potato starch, maltodextrin, tomato powder, salt, dextrose, natural flavor, yeast extract, paprika extract (color). Group 4. Maltodextrin is fourth, and there are four more markers after it.
• Bakery sourdough: wheat flour, water, salt. Group 3. Flour and water with salt added.

Paste each one into the label checker, then try the one in your kitchen.