A new study finds that Greek koulouri bread, the sesame-crusted ring sold on street corners across Thessaloniki, packs more nutrition and flavor science than its humble reputation suggests.
The study, led by Maria Irakli of the Institute of Plant Breeding and Genetic Resources in Thermi, Thessaloniki, was published in the Journal of Food Composition and Analysis.
It offers the first detailed look at the nutrients, plant compounds, and aroma chemistry behind the popular snack known locally as Koulouri Thessalonikis.
Researchers collected commercial samples from bakeries and street vendors in Thessaloniki and tested them for protein, fiber, fat, and a group of plant compounds called lignans. The bread turned out to be a solid source of protein and dietary fiber.
It also contained notable amounts of sesaminol triglucoside, a lignan tied to antioxidant and anti-inflammatory effects in earlier research. Ring-shaped loaves carried higher levels of this compound than the stick-shaped version.
High protein, fiber, and lignans found in koulouri samples
The snack is also calorie-dense. Some samples reached 449 calories per 100 grams, mostly because of the sesame seed coating that covers the dough. That coating does more than add crunch. It supplies fat, calcium, and protein, nutrients that sesame seeds are known for.
To understand what gives the bread its smell and taste, the team used a lab technique called solid-phase microextraction paired with gas chromatography-mass spectrometry. The method identified 54 different aroma compounds in the bread.
Of those, 21 stood out as the main contributors to its scent, based on their strength relative to human smell thresholds. Together, these compounds create the roasted, nutty, citrus, and herbal notes people associate with fresh koulouri.
A trained taste panel also rated the bread for flavor and texture. The ring-shaped version scored higher across the board. Tasters preferred its overall taste, its sesame flavor, and its crispiness compared with the stick-shaped loaves.
Greek koulouri bread could qualify as a functional food
Researchers said the findings point to koulouri as more than a casual breakfast item or snack. They described it as a candidate for functional food status, meaning it could offer health benefits beyond basic nutrition.
At the same time, they noted that production methods vary widely among bakeries, which affects quality and consistency. The study calls for clearer standards in how the bread is made, so its nutritional value and signature taste remain consistent from one bakery to the next.
The work adds scientific weight to a food long defined by tradition rather than data, tracing a path from ancient Byzantine street vendors to a modern snack now backed by laboratory analysis.
See all the latest news from Greece and the world at Greekreporter.com. Contact our newsroom to report an update or send your story, photos and videos. Follow GR on Google News and subscribe here to our daily email!
