When a product developer sets out to reduce sugar, the conversation almost always starts with sweetness — how to keep the product tasting right with less sugar in it. But there is a second problem that surfaces later, often after the first production trials, and it catches teams off guard: the reduced-sugar version dries out, hardens and stales faster than the original. The culprit is not the sweetener system. It is the loss of one of sugar’s least-appreciated jobs — holding moisture. This is the problem MoistPlus® is built to solve.

Sugar Does More Than Sweeten

In a finished food, sugar is doing several jobs at once. It sweetens, yes — but it also contributes bulk, influences texture, and, crucially, helps manage moisture. Sugar is hygroscopic: it binds water and helps hold it in the product, keeping baked goods soft and bars chewy rather than hard.

When you pull sugar out and replace its sweetness with a high-intensity sweetener, you restore the taste but not the moisture function. High-intensity sweeteners are used at tiny inclusion levels, so they contribute almost nothing to the product’s moisture balance or bulk. The result is a reduced-sugar product that may taste fine on day one but turns dry, firm and stale far quicker than the full-sugar original. Many teams discover this only when shelf-life testing reveals the reformulated product failing on texture long before the original would.

This is why a like-for-like sweetener swap so rarely produces a like-for-like product. Sweetness is the most visible thing sugar does, but it is not the only thing — and the functions that are easiest to overlook, moisture management chief among them, are often the ones that determine whether a reformulated product succeeds in the market or quietly fails on shelf. A product that hardens halfway through its stated shelf life will generate complaints and returns no matter how good it tasted at launch.

Why This Is Really a Water-Activity Problem

The technical heart of the issue is water activity — the amount of free, available water in a food. Water activity, not total moisture content, is what governs how a product stales, how its texture holds, and how stable it is over shelf life. It is widely used as the primary lever to predict and control the shelf life of bakery and other products.

Sugar helps manage water activity by binding free water. Remove it, and the product’s water-activity balance shifts — free water behaves differently, texture drifts, and the product is more prone to drying out or, in some cases, to other moisture-driven defects. So a sugar-reduction project is not only a sweetness problem; it is a moisture-and-water-activity problem that has to be solved in parallel.

There is a related, subtler issue in multi-component products. Moisture migrates from areas of high water activity to areas of low water activity, regardless of moisture content — which is why a filling can go dry while a coating goes soggy. Reformulating the sugar in one component can upset a previously balanced system, making moisture management even more important.

How MoistPlus® Solves the Moisture Side

MoistPlus® is a humectant: a hygroscopic ingredient that binds water and holds it in the product. Used in a reduced-sugar formulation, it restores the moisture-retention function that sugar provided — independently of the sweetener system. The sweetener handles taste; MoistPlus® handles moisture and softness.

Made from natural unmodified cassava (tapioca) starch, MoistPlus® is a clear, colourless, near-odourless syrup, so it does this work without adding colour, off-flavours or cloudiness. In practice, in a reduced-sugar product it:

• Keeps the product soft. It binds water in the matrix, maintaining the moist, tender texture that the removal of sugar would otherwise cost.
• Supports shelf life. By helping manage moisture and water activity, it helps the reduced-sugar product stay fresh and soft for longer rather than staling early.
• Improves binding and texture. Particularly valuable in bars and formed products, where reduced sugar can leave the matrix loose or crumbly.
• Adds nothing to the label that consumers question. It declares simply as tapioca starch or tapioca syrup, which fits the clean-label intent that usually drives sugar reduction in the first place.

An Honest Note on Positioning

It is worth being precise about what MoistPlus® does and does not do in this context, because honesty here is what makes the solution work. MoistPlus® does not reduce sugar — it is a humectant that contains naturally occurring sugars, not a sweetener or a sugar replacer. Its role is to solve the moisture consequence of sugar reduction, working alongside whatever sweetener and bulking system you use to handle sweetness and body.

In other words, a well-designed reduced-sugar formulation usually has three jobs to cover: sweetness (a sweetener, such as our HaloSweet® allulose), bulk and fiber (a bulking agent such as FiberWorks® where appropriate), and moisture and softness (a humectant such as MoistPlus®). Trying to make one ingredient do all three is where reformulations usually fail. MoistPlus® owns the moisture job and does it well.

A Practical Way to Approach It

For teams tackling this, it helps to treat the moisture problem as a deliberate step in the reformulation rather than something to troubleshoot after the fact. A workable sequence looks like this. First, establish the texture and shelf-life target the original full-sugar product hits — that is the benchmark the reformulation has to match, not just on taste but on softness and staling rate. Second, build the sweetness back with your chosen sweetener system. Third, address bulk and solids, since removing sugar removes mass that often has to be rebuilt. And fourth — the step most often left until problems appear — restore the moisture and water-activity balance with a humectant such as MoistPlus®, trialling the level against the texture and shelf-life benchmark from step one.

Approached this way, the moisture penalty stops being a nasty surprise in shelf-life testing and becomes a planned part of the formulation. It also makes the role of each ingredient clear, which is what allows a team to adjust one lever without unbalancing the others.

Where This Matters Most

The moisture penalty of sugar reduction hits hardest in products that depend on softness and moisture for their eating quality:

• Snack and protein bars — where reduced sugar can turn a chewy bar hard and dry, and where MoistPlus® also helps bind the matrix.
• Baked goods — cookies, cakes and muffins that stale and firm up quickly once sugar is cut.
• Gluten-free baked goods — already prone to drying out, and doubly challenged when sugar is also reduced.

These sit squarely in the shelf-life extension, humectancy and moisture migration toolset.

Frequently Asked Questions

Does MoistPlus® reduce sugar? No. It is a humectant, not a sweetener or sugar replacer — it actually contains naturally occurring sugars. Its job is to fix the moisture problem that sugar reduction creates, alongside your sweetener system.

Why do reduced-sugar products dry out? Because sugar binds water and helps manage water activity. When it is removed and replaced by a high-intensity sweetener, that moisture-holding function is lost, so the product stales and hardens faster.

Can MoistPlus® be used with allulose or other sweeteners? Yes — that is exactly the intended use. The sweetener handles taste; MoistPlus® handles moisture and softness. They do different jobs.

Will it affect the colour or flavour of my product? It is clear, colourless and near-odourless, so it integrates with minimal impact on the finished product’s appearance or taste.

Is it clean-label? Yes — it declares simply as tapioca starch or tapioca syrup, replacing synthetic humectants like glycerine and sorbitol that work against a clean label.

The Bottom Line

Sugar reduction has a hidden cost that does not show up until the product starts drying out and staling early — the loss of sugar’s moisture-holding function. Solving it means treating sugar reduction as a moisture-and-water-activity problem, not just a sweetness problem. MoistPlus® is the humectant built for that job: a clean-label tapioca syrup that restores softness and shelf life to reduced-sugar formulations, working alongside your sweetener and bulking system rather than trying to replace them.

To tackle the moisture side of a sugar-reduction project, or to request a sample and full documentation pack, contact our team.