Sweet Protein Brazzein May Tame Post‑Meal Sugar Spikes, New Study Finds

Imagine scooping a serving of vanilla ice‑cream that tastes as sweet as sugar but doesn’t send your blood glucose sky‑high. That’s essentially what a recent Russian study suggests might be possible, thanks to a little‑known protein called brazzein.

Brazzein isn’t a synthetic sweetener you’ll find on supermarket shelves. It’s a natural protein first isolated from the West African oubli fruit, and scientists have learned to churn it out in labs using fermentation. Its sweetness is intense – many times that of table sugar – yet it contains almost no calories.

In a randomized trial published in Clinical Nutrition ESPEN, researchers from the Federal Research Centre of Nutrition, Biotechnology and Food Safety in Russia recruited 101 adults diagnosed with metabolic‑dysfunction‑associated steatotic liver disease (MASLD). That’s a mouthful, but essentially it’s fatty‑liver disease linked to obesity and diabetes.

Each participant ate a 100‑gram scoop of vanilla ice‑cream on three separate days. One day the ice‑cream was sweetened with regular sucrose, another day with brazzein, and the third day with brazzein plus a bit of inulin – a soluble fibre that’s often added to boost gut health. Blood‑sugar levels were measured before and after the treat.

The results were striking. Both the brazzein‑only and the brazzein‑plus‑inulin desserts produced noticeably smaller post‑meal glucose spikes compared with the sugar‑sweetened version. The effect was even more pronounced in participants who already had type‑2 diabetes.

"We’re seeing a real blunting of the glycaemic response," the authors wrote, but they were careful to note that this was a short‑term experiment. "Longer‑term studies are needed to determine whether repeated substitution of sucrose‑containing desserts with brazzein‑sweetened alternatives translates into sustained metabolic, hepatic, microbiome, or behavioural benefits," they added.

That caveat matters because the World Health Organization, in a 2023 guidance, warned that many non‑sugar sweeteners could carry unwanted health effects when used long‑term, including a possible rise in diabetes and heart disease risk. Brazzein, being a protein rather than a synthetic chemical, might sidestep some of those concerns, but only time – and bigger studies – will tell.

For now, the findings add a tasty footnote to the growing conversation about sugar substitutes. If future research confirms the benefits, you could soon be swapping sugar for a protein‑derived sweetener in everything from desserts to beverages, perhaps without the dreaded blood‑sugar roller coaster.