Identification of FGF21-Inducing Rare Sugars That Reduce Sugar Appetite in Male BL Mice

Sweetness alone does not control sugar intake. That is the core problem in reformulation. This new study points to a different approach: choose sweeteners that do more than taste sweet. They can also quiet the signal that drives sugar seeking.

Researchers screened rare sugars in mouse primary hepatocytes and found three FGF21 inducers: D-allulose, D-tagatose, and D-sorbitol. FGF21 is a liver hormone linked to sugar appetite. When the team gave these sugars to male BL mice by gavage, sugar intake went down. When they mixed the rare sugars with a sucrose solution, both intake and preference fell.

Background

FGF21 matters because it sits at the crossroads of metabolism and behavior. The liver releases it in response to certain nutrients. That signal can change how much sugar an animal wants. The researchers wanted to know whether specific sugars could trigger FGF21, not just deliver sweetness. The answer is yes.

Three compounds stood out from the screen. Each one induced FGF21 in primary mouse hepatocytes. That set the stage for the animal work.

What the study did

The team used mouse primary hepatocytes to measure FGF21 induction. They exposed the cells to rare sugars and identified D-allulose, D-tagatose, and D-sorbitol as potent inducers.

Then they moved to live animals. They gave male BL mice intragastric doses of these sugars. In separate trials, they mixed the rare sugars with a sucrose solution. The mice could drink freely. The team measured how much they drank and which solution they preferred.

The results were consistent. FGF21-inducing rare sugars lowered sugar intake. Mixed with sucrose, they reduced both intake and preference.

Key findings

Three findings deserve attention.

First, the rare sugars themselves are active signals. They are not just sweet molecules. They trigger FGF21 release from liver cells.

Second, the effect carries into whole animals. Gavage of these sugars reduced sugar intake.

Third, mixing matters. When the rare sugars were combined with sucrose solution, the mice drank less overall and showed a lower preference for the sweet solution.

Here is how the evidence lines up:

Compound	Finding in the study	What it suggests
D-allulose	FGF21 inducer; improved palatability while suppressing appetite; prolonged satiety; reduced total intake of a sucrose-containing solution	Has dual value in sugar-reduced formulas
D-tagatose	FGF21 inducer; mixed with sucrose, reduced intake and preference	Useful in blends with sucrose
D-sorbitol	FGF21 inducer; mixed with sucrose, reduced intake and preference	Another blending option for reformulation

D-allulose did the most interesting work. It kept the solution palatable, which is critical for consumer acceptance. At the same time, it suppressed appetite and extended fullness. That combination is rare. Most sweeteners either taste good or reduce intake. D-allulose did both in this model.

What it means for manufacturers

Formulators usually select sweeteners by sweetness curve, solubility, and cost. This study adds another variable: biological signaling. The choice of sweetener can influence the desire to keep drinking or eating. That changes the reformulation playbook.

D-allulose appears to bridge two goals. It can improve palatability while also reducing total intake. D-tagatose and D-sorbitol may support that effect in blends. The mouse data are early, but they give a clear starting point for prototype work.

Can you replace all sugar with these rare sugars? This study does not answer that. It tested solutions, not finished foods. But it does suggest a rational approach: build a sweetener system around D-allulose, then adjust with D-tagatose or D-sorbitol. Then measure intake effects in your own consumer or sensory model.

FAQ

Does this prove a human effect?

No. The study used mouse hepatocytes and male mice. Human physiology may respond differently. Use this as a hypothesis for product development, not as a label claim.

Which sugar should I test first?

D-allulose showed the widest effect. It maintained palatability, suppressed appetite, prolonged satiety, and reduced total intake of a sucrose solution. The other two do not have the same full profile in this paper.

Can I mix these with sucrose?

That is exactly what the researchers did. Mixing rare sugars with a sucrose solution lowered intake and preference in mice. This supports the idea of partial sucrose replacement rather than total removal.

The sugar problem is not only about sugar content. It is about sugar demand. These rare sugars address both sides. D-allulose, D-tagatose, and D-sorbitol give formulators a new reason to build blends around them. The mouse data are early, but the direction is clear. Ingredients that affect appetite can earn their place in the formula.