Mushroom Peptides Boost Saltiness Perception Without Adding Sodium

High sodium intake is a major risk factor that elevates blood pressure and increases the risk of cardiovascular disease. The World Health Organization recommends that adults consume less than two grams of sodium per day, equivalent to less than five grams of table salt. However, reducing the amount of salt in food significantly alters its taste, making it difficult for many to maintain a healthy, low-sodium diet over time. Now, researchers from China offer a potential solution to this problem.

Small Molecules from Edible Mushrooms

In a new study published in the journal npj Science of Food, a team of scientists from Jiangnan University and Shanxi University examined short protein fragments called peptides, extracted from edible oyster mushrooms. These molecules may carry umami flavors and affect taste perception in the mouth. The researchers broke down mushroom proteins using enzymes and utilized computational tools and machine learning to filter thousands of sequences, eventually narrowing down to five leading candidates for laboratory testing.

Later in the experiment, 14 trained tasters in a laboratory setting compared regular salt solutions to solutions incorporating the molecules. Three molecules stood out in particular: the first increased the perceived saltiness rating by 70.59 percent, while the other two increased saltiness by 49.02 and 47.06 percent, respectively. In addition to enhancing flavor intensity, an extension in the duration of the saltiness sensation in the mouth was also recorded, rising from 75 seconds to 105 seconds—a finding supported by electronic tongue tests.

Can We Already Reduce Salt?

To understand the mechanism, the researchers used computerized models of the TMC4 protein, which is associated with the perception of salty taste. Simulations showed that the peptides form stable bonds with the protein, primarily through hydrogen bonds, which may explain the enhancement in saltiness perception. However, the researchers clarify that this is only a hypothetical explanation, and additional experiments on taste cells are required to confirm how the molecules operate in the human body.

The researchers emphasize that an increase in perceived saltiness does not mean one can reduce 71 percent of the salt in food. The experiment was conducted in water and salt solutions only, and the actual amount of sodium that can be cut while maintaining flavor was not tested. Experiments in real food products are now planned to examine safety, stability, and practical impact.