When reading food labels, you should strive to get more of certain nutrients (fiber, vitamin D, calcium, iron, and potassium) and less of others (saturated fat, sodium, and added sugars) each day. The simplest tool for doing this is the Percent Daily Value (%DV) column on the right side of every Nutrition Facts label. As a general rule: 5% DV or less per serving means a food is low in that nutrient, and 20% DV or more means it’s high. Your daily goal is to aim high for the nutrients your body needs and stay low for the ones linked to chronic disease.
How Percent Daily Value Works
Every %DV on a food label is calculated against a 2,000-calorie daily diet. That number won’t match everyone’s actual calorie needs, but it gives you a consistent benchmark for comparing products. If one cereal lists 15% DV for fiber and another lists 4%, you know the first one contributes meaningfully to your daily goal and the second barely registers.
The 5/20 rule makes label reading fast. Scanning the %DV column, anything at 5% or below is essentially a trace amount. Anything at 20% or above delivers a significant chunk of your day’s intake in a single serving. This works in both directions: 20% DV of calcium is great, but 20% DV of sodium means that one serving just ate up a fifth of your daily limit.
Nutrients to Get More Of
The FDA requires four micronutrients on every Nutrition Facts label because most people don’t get enough of them: vitamin D (daily value of 20 micrograms), calcium (1,300 milligrams), iron (18 milligrams), and potassium (4,700 milligrams). These support bone health, oxygen transport in your blood, muscle function, and blood pressure regulation. When comparing products, look for higher %DV numbers for all four.
Dietary fiber is the other nutrient most Americans fall short on. Women between 19 and 50 need 25 to 28 grams per day, while men in the same age range need 31 to 34 grams. After age 50, those targets drop slightly to 22 grams for women and 28 grams for men. A food with 20% DV or more of fiber per serving is a strong choice. Fiber keeps digestion regular, helps stabilize blood sugar, and contributes to feeling full after a meal.
Protein is listed on every label but usually without a %DV. The baseline recommendation for sedentary adults is 0.8 grams per kilogram of body weight, which works out to roughly 10% to 35% of total daily calories. If you exercise regularly, that need rises to 1.1 to 1.5 grams per kilogram. People over 40 benefit from aiming closer to 1.0 to 1.2 grams per kilogram to help offset the natural loss of muscle mass that comes with aging.
Nutrients to Limit
Sodium, saturated fat, and added sugars are the three nutrients where you want the lowest %DV numbers possible. Each is linked to increased risk of heart disease, high blood pressure, or other chronic conditions when consumed in excess.
For sodium, the daily cap is 2,300 milligrams for adults, which is roughly one teaspoon of table salt. Sodium adds up quickly in processed foods, canned soups, sauces, and deli meats. A single serving that shows 20% DV or more should be a red flag, especially if you tend to eat more than the listed serving size.
Saturated fat should stay below 10% of your total daily calories. On a 2,000-calorie diet, that means no more than about 20 grams. Foods high in saturated fat include full-fat dairy, fatty cuts of meat, and many baked goods. Look for products with 5% DV or less per serving.
Added sugars have their own line on the label, separate from total sugars (which include the natural sugars in fruit and milk). The target is less than 50 grams per day on a 2,000-calorie diet, representing no more than 10% of your calories. A single flavored yogurt or granola bar can contain 12 to 15 grams, so checking this line before buying saves you from unknowingly blowing past your limit before lunch.
Trans Fat: A Special Case
Trans fat has no safe daily target. You should aim for zero. But the label has a loophole worth knowing about: if a product contains less than 0.5 grams of trans fat per serving, the manufacturer can legally print “0 g” on the label. That means a food labeled as having zero trans fat can still contain small amounts. If you eat multiple servings, or several of these products in a day, those trace amounts add up. Check the ingredient list for “partially hydrogenated oils,” which is the primary source of artificial trans fat.
Serving Size vs. What You Actually Eat
Every number on a food label is tied to the serving size printed at the top. By law, serving sizes must reflect the amount people typically eat, not the amount they should eat. This is an important distinction. A serving of ice cream is two-thirds of a cup, but most people scoop out more than that. A bag of chips might list a serving as 15 chips when you’re likely eating 30.
Before reading any nutrient values, check the serving size and servings per container. If a bottle of juice says it contains 2.5 servings and you drink the whole thing, you need to multiply every number on the label by 2.5. The 30% DV of sugar per serving just became 75% of your daily limit in one bottle.
A Quick Label-Reading Routine
You don’t need to memorize every gram target. A practical daily approach involves three steps at the grocery store:
- Check the serving size first. Make sure it matches the amount you’d actually eat. If not, mentally adjust the numbers.
- Scan the %DV column for nutrients to limit. Keep sodium, saturated fat, and added sugars at 5% DV or less per serving when possible.
- Look for nutrients to build up. Choose foods where fiber, calcium, vitamin D, iron, or potassium hit 20% DV or higher per serving.
Over the course of a full day, your goal is to reach close to 100% DV for the nutrients you need while staying well under 100% for the ones you’re limiting. No single food has to be perfect. A meal that’s a bit high in sodium can be balanced by lower-sodium choices the rest of the day. What matters is the overall pattern, and the %DV column makes tracking that pattern simple enough to do in a few seconds per package.