A peptide that makes salt taste 71% saltier

Published in npj Science of Food on 20 October: AI-guided discovery of salty and saltiness-enhancing peptides from fungi. A related study using beech mushroom peptides found the strongest candidate increased perceived saltiness by about 71%, and that the sensation lingered for 105 seconds against 75 for plain salt.

That second number is arguably the more interesting one. Saltiness is a fast, front-loaded sensation that falls away quickly, and a good deal of what makes a low-sodium product taste thin is not the peak but the drop after it.

The part nobody puts in the headline

The researchers did not establish how much sodium could actually be cut.

That is not a small caveat, it is the whole commercial question. "Tastes 71% saltier" and "lets you remove 30% of the salt" are different claims, and only the second one is a reformulation. Perceived intensity in a model system does not automatically survive a real food matrix, a shelf life, or a cost sheet.

So: genuinely promising, and not yet a product. The honest position is that this is the direction sodium reduction is heading, not a thing you can specify next month.

Why it is worth tracking anyway

Because salt is about to get more expensive to use, in the regulatory sense rather than the financial one. South Africa's draft R3337 would put a front-of-pack warning on products high in salt. The US has just finalised a rule widening where salt substitutes may be used in standardised foods. Both push the same way, and both arrive before anybody has a clean answer.

Enhancement and substitution are the two routes, and they have different problems. Substitution — usually potassium chloride — works but brings a bitter, metallic note you then have to cover. Enhancement promises to avoid that by making less salt go further, which is why peptide work of this kind gets attention well before it is ready.

Masking the first is something a flavour house can do today. The second is worth watching closely and specifying carefully.

Reporting: npj Science of Food · ScienceAlert · Flavour and Fragrance Journal