It depends entirely on the type. Plain yogurt contains about 4 to 7 grams of naturally occurring sugar per serving, all from lactose, the sugar found in milk. Flavored yogurt is a different story: a single 6-ounce container can pack 15 grams of total sugar or more, with roughly half of that coming from added sweeteners.
Sugar in Plain Yogurt
Plain yogurt with no added sweeteners contains only lactose. A 150-gram serving (about 5 ounces) has around 4.8 grams of this natural milk sugar. Brigham and Women’s Hospital puts the floor at about 7 grams per 6-ounce serving, noting that any sugar listed above that number means sweetener has been added. Fat content matters here too: higher-fat plain yogurt tends to have slightly less lactose per serving than low-fat versions, simply because more of the weight comes from fat.
This level of sugar is modest by any standard. For context, a medium banana has about 14 grams of sugar, and a cup of whole milk has around 12 grams. Plain yogurt sits well below both.
Where Flavored Yogurt Gets Tricky
Flavored yogurt is where sugar content jumps sharply. Fruit-on-the-bottom, vanilla, and strawberry varieties routinely contain 10 to 15 grams of total sugar per 6-ounce serving, with added sugars making up the bulk of the difference from plain. The FDA’s example Nutrition Facts label for sweetened yogurt shows 15 grams of total sugar, 7 of which are added. That single container accounts for 14% of the recommended daily limit for added sugars.
The USDA’s child nutrition program caps yogurt at 12 grams of added sugars per 6 ounces, which gives you a rough sense of how high some products go. If a program designed for children felt the need to set a ceiling, many commercial yogurts were exceeding it. A vanilla yogurt meeting that standard might still contain 10 grams of added sugar, which is 20% of the 50-gram daily limit recommended by the Dietary Guidelines for Americans.
Greek Yogurt and Skyr
Greek yogurt and Icelandic skyr are strained to remove liquid whey, which concentrates the protein but also removes some lactose in the process. A plain Greek yogurt typically contains less sugar per serving than regular plain yogurt. Brigham and Women’s Hospital recommends choosing yogurt with no more than 13 grams of sugar per 6-ounce serving as a general guideline, and plain Greek yogurt usually falls well under that.
Flavored Greek yogurt, however, can match or exceed regular flavored yogurt in added sugars. The straining process doesn’t protect you from sweeteners added after the fact. Check the label rather than assuming “Greek” means low sugar.
Low-Fat Yogurt Is Not Always Higher in Sugar
There’s a common belief that manufacturers load low-fat yogurt with extra sugar to compensate for the missing fat. A large UK survey published in BMJ Open found the opposite: low-fat yogurt products actually averaged less sugar (10.7 grams per 100 grams) than higher-fat yogurts (13.1 grams per 100 grams). Low-fat versions also had lower calories overall and slightly more protein.
That said, the picture isn’t reassuring. More than half of the low-fat yogurts surveyed still contained 10 to 20 grams of sugar per 100 grams. So while full-fat yogurt isn’t the healthier choice by default, low-fat doesn’t guarantee a low-sugar product either. You still need to read the label.
Plant-Based Yogurt Alternatives
Switching to non-dairy yogurt doesn’t automatically reduce sugar. A study published in Nutrients examined hundreds of plant-based yogurts and found wide variation. Almond-based yogurts had a median of 12.5 grams of sugar per serving. Oat-based yogurts came in lower at about 9 grams, while soy-based yogurts were the highest at a median of 16 grams per serving. For comparison, flavored dairy yogurt across multiple countries averaged about 17 grams per 150-gram serving.
Because plant-based yogurts don’t contain lactose, nearly all of their sugar is added during manufacturing to improve taste and texture. If you’re choosing a dairy-free option specifically to reduce sugar, unsweetened varieties exist, but flavored plant-based yogurts can be just as sugary as their dairy counterparts.
How to Read Yogurt Labels
The Nutrition Facts panel now separates “Total Sugars” from “Added Sugars,” which makes yogurt much easier to evaluate. The word “includes” before “Added Sugars” tells you that the added sugar number is part of the total, not in addition to it. If a yogurt lists 15 grams of total sugar and 7 grams of added sugar, the remaining 8 grams are naturally occurring lactose.
Ingredient lists can be harder to decode. Sugar goes by at least 61 different names on food labels, including cane juice, dextrose, maltose, rice syrup, barley malt, high-fructose corn syrup, and fruit juice concentrate. Yogurt brands sometimes use fruit juice or fruit puree as sweeteners, which may sound healthier but contribute sugar just the same. If any of these appear in the first few ingredients, the product is meaningfully sweetened.
Some yogurts marketed as “sugar-free” or “light” replace sugar with non-nutritive sweeteners like stevia, sucralose, or monk fruit extract. These contribute little to no calories and won’t raise blood sugar in the way that added sugars do, but they do alter taste. Whether you prefer these over a moderately sweetened yogurt is a personal call.
Choosing a Lower-Sugar Yogurt
The simplest approach is to start with plain yogurt, either regular or Greek, and sweeten it yourself. A teaspoon of honey or a handful of berries adds 4 to 6 grams of sugar, which still keeps you well below what most pre-flavored yogurts contain. You control the amount, and you can gradually reduce it as your palate adjusts.
If you prefer buying flavored yogurt, look for products with no more than 6 to 8 grams of added sugars per serving. That range keeps a single container under 15% of the daily recommended limit. Check the total sugar line as well: anything above 13 grams per 6-ounce serving is on the high end, regardless of whether the label says “natural” or “organic.” Those terms have no bearing on sugar content.