A serving of flavored yogurt can contain as much as 20 grams of added sugar. Plain yogurt usually has under 5 grams of sugar from lactose in milk. Front-of-package language can make the difference easy to miss.
Anne VanBeber, PhD, RD, LD, is a professor in the Department of Nutritional Sciences at Texas Christian University. She says her perspective changed after she became a practicing dietitian and began counseling patients. Familiar breakfast products can project a healthy image while their nutrition panels tell a different story.
Check the numbers beyond the front of the package
When assessing cereal or granola bars, VanBeber recommends checking whether whole grains appear near the beginning of the ingredient list. Oats are one common option, but their presence alone does not guarantee a bar is high in fiber or low in sugar. The same scrutiny used for convenience-food label checks can help shoppers see what a product actually offers.
A useful guide is a carbohydrate-to-fiber ratio of about 5:1, or roughly five grams of carbohydrates for each gram of fiber. VanBeber also advises keeping cereal at or below 3 grams of fat per serving. Some bars offer whole grains and protein. They may also provide fiber. Others contain added sugar and little fiber, so check the label before buying.
Sweetness and meal balance matter
For yogurt, VanBeber recommends choosing options with less than 10 grams of added sugar per serving. Many flavored varieties can reach 20 grams. Plain yogurt is another option. Fresh or frozen fruit can add sweetness, while the yogurt's own sugar generally comes from lactose.
U.S. Food and Drug Administration rules require Nutrition Facts labels to list added sugars separately from total sugars. That distinction helps shoppers separate lactose naturally present in milk from sugars added during production.
In a September 11, 2026 warning letter, the FDA said a product label lacked an added-sugars declaration. It also required vitamin D and potassium information under 21 CFR 101.9(c). The agency described the labeling as misbranded under Section 403(q) of the Federal Food, Drug, and Cosmetic Act. For shoppers comparing these products, the Nutrition Facts panel and ingredient list offer details that front-of-package claims do not.
Smoothies can also be high in sugar. Fruit contributes natural sugars, but a high carbohydrate load from those sugars may still affect post-meal blood sugar. VanBeber suggests including a serving or two of vegetables and using the 5:1 carbohydrate-to-fiber ratio as a guide.
When a smoothie is meant to replace a meal, VanBeber recommends adding protein and some fat. She names milk or yogurt as options, along with cottage cheese. Nuts or seeds can work, too. So can tofu or protein powder. Her target is 20 to 30 grams of protein for a meal-replacement smoothie.
