What “Low Sugar” Actually Means — And How Home Canning Puts You Back in Control

As a Certified Diabetes Care and Education Specialist, one of the most common questions I get isn’t about carb counting or medication timing — it’s about food labels. People want to know what they’re actually buying, and sugar claims are some of the most misunderstood words on a package.

So let’s answer the question people ask us most directly: what does low sugar mean? And let’s talk about why home canning is one of the most practical tools you have for taking that control back.

Why Added Sugar Deserves a Second Look

Added sugar isn’t the villain it’s sometimes made out to be, but most of us eat more of it than we realize, and that adds up in ways that matter for long-term health — especially for anyone managing or trying to prevent diabetes, prediabetes, or general metabolic health concerns.

The American Heart Association recommends capping added sugar at roughly 6 teaspoons (about 25 grams) a day for women and 9 teaspoons (about 36 grams) for men. The World Health Organization recommends keeping added sugar under 10% of total daily calories, with an ideal target closer to 5%. For context, the typical American diet contains far more carbohydrate — including added sugar — than most people managing blood sugar actually need.

None of this means sugar is off-limits. The American Diabetes Association is clear that people with diabetes can still enjoy sugar in moderation. It’s about balance, not elimination. But it does mean it’s worth knowing what’s actually in the food you’re buying, rather than trusting a headline claim on the front of the jar.

What Does “Low Sugar” Mean?

This is the part that surprises most people. The FDA regulates several sugar-related claims very specifically:

• “Sugar Free” legally means less than 0.5 grams of sugar per serving.
• “No Sugar Added” means no sugar or sugar-containing ingredient was added during processing — the food can still contain naturally occurring sugar.
• “Reduced Sugar” or “Less Sugar” means the product contains at least 25% less sugar than a standard reference version of that food.

Here’s the detail that matters most for anyone shopping a farmers market or grocery aisle: “low sugar” is not an FDA-defined term. No legal threshold requires a product to meet that claim. Unlike “sugar free” or “reduced sugar,” it isn’t a regulated claim at all. That means when you see “low sugar” on a label or hear it from a seller, it could mean almost anything.

This is why it’s worth asking a direct question the next time someone tells you a product is “low sugar”. Ask them, ” Low compared to what? By what measurement? A product can be technically lower in sugar than a very sweet reference item and still contain a substantial amount. Don’t be afraid to ask; a seller who has done the work to actually reduce sugar meaningfully should be able to tell you specifics.

Where Sugar Hides in Store-Bought Preserves

Jam is an easy example, but it’s far from the only place this shows up. Take a look at labels next time you’re shopping. You’ll find added sugar in places that might surprise you. Barbecue sauce, pickle relish, canned tomatoes, salsa, even some pickled vegetables use sugar as a flavor balancer or preservative aid. Sodium works the same way in many canned and jarred goods, often well beyond what a homemade version would need.

Why Traditional Jam Leans on Sugar

Jam is a particularly clear example of how this happens. Traditional jams and jellies are typically 50–65% sugar by weight. That’s not a manufacturing shortcut — it’s baked into how jam has worked for centuries. Sugar does more than sweeten. It draws water out of fruit to help pectin form the gel that gives jam its texture. The high sugar concentration acts as a natural preservative that helps the jam stay shelf-stable.

That’s why simply “cutting the sugar” in a normal jam recipe doesn’t work. The jam won’t set properly, and it becomes more vulnerable to spoilage once opened. Making a true low-sugar jam that still sets and stores safely requires a completely different approach. My husband Scott does all our jam and jelly making, and he spent real time developing a recipe that holds together properly at a much lower sugar ratio. It’s not a shortcut; it’s a different formula he built from the ground up. It’s one example of a broader pattern. Much of what goes into shelf-stable preserves is there for function — texture, shelf life, consistency. It’s not just flavor, and sugar and sodium often do more of that work than people realize.

None of this is a knock on tradition. Sugar’s role in jam made complete sense in a world without refrigeration. And plenty of wonderful jam makers still follow that formula today. But that constraint doesn’t really apply to most of our kitchens anymore. Most of us consume more added sugar than the evidence suggests is good for long-term health. Jam doesn’t have to be one more place it sneaks in by default.

Taste the Difference Yourself

If you’re local, you don’t have to take our word for any of this — come ask us yourself. We sell Scott’s low-sugar jams and jellies at the Buffalo Gap Farmers Market. We are always happy to talk to you about what’s in the jar and why. If you need more convincing than our word: this year, Scott entered his low-sugar Red Caribbean Habanero Peach jam in the West Texas Fair & Rodeo — and took Third Place! This was without the judges knowing it was low-sugar. Come by, ask him questions, and buy with confidence.

How Home Canning Puts You Back in the Driver’s Seat

This is where my world and Scott’s really overlap. I do the diabetes education; Scott does the actual growing and jam making. He’s the one out working the farm and standing over the stove getting the ratios right. But the principle is the same one I teach my clients. One of the most empowering things about learning to can your own food is controlling every ingredient in the jar. You’re not guessing what “reduced sugar” means on someone else’s label. Scott knows exactly how much sugar, salt, or anything else is in there, because he put it there himself.

If you’re intimidated by the process, the good news is that it’s much more approachable than it looks. A few places to start:

• Our guide to the must-have supplies for home canning walks through exactly what you need to get started.
• Our overview of canning and fermenting at home is a good next step if you want the bigger picture of how these preservation methods fit together.
• If you live somewhere with elevation to account for, don’t skip our guide on how altitude affects canning — it changes your processing times.

Once you’re comfortable with the basics, you can apply this same thinking to almost anything you buy off a shelf. Pickles with exactly as much salt as you want. Tomato sauce without added sugar, jam built around fruit instead of a sugar-to-fruit ratio designed for shelf life. It’s a genuinely practical way to put your own health goals ahead of a manufacturer’s shelf-stability formula.

Where to Go From Here

If this is your first time here, welcome. We talk a lot about growing, cooking, and preserving food with intention on this site. If the labeling conversation resonated with you, you might enjoy our “Store Bought” video series. These videos will be rolling out this week and next.

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Sources & Further Reading

• U.S. Food and Drug Administration — Guidance for Industry: “Sugar Free” Claims. Defines the regulatory requirements for “sugar free” claims under 21 CFR 101.60(c).
• Michigan State University Extension — “Sugar Label Claims.” Summarizes FDA-defined sugar claims, including “sugar free,” “no added sugar,” and “reduced sugar.”
• American Heart Association — added sugar intake recommendations (approximately 6 teaspoons/day for women, 9 teaspoons/day for men).
• World Health Organization — guidance recommending added sugar intake below 10% of total daily calories, with an ideal target below 5%.
• American Diabetes Association — Nutrition & Wellness guidance on minimizing added sugars as part of a healthy eating pattern for people with and without diabetes.