What the Science Actually Says About Istanbul's Traditional Diet — and Why Researchers Are Taking It Seriously

Turkish cuisine has long been celebrated at the table. Now it is earning attention in the laboratory. A growing body of peer-reviewed research published between 2022 and 2025 positions the traditional Anatolian-Mediterranean diet — heavy on legumes, fermented foods, seasonal vegetables and cold-pressed olive oil — as one of the more robustly studied eating patterns for metabolic and cardiovascular health. For Istanbul's 15 million residents, that validation lands close to home.

The timing matters. Turkey's Ministry of Health reported in its 2025 National Nutrition Survey that 32 percent of urban Turkish adults now meet the clinical threshold for metabolic syndrome, a cluster of conditions including high blood pressure, elevated blood sugar and abdominal obesity. The figure is sharply higher in cities than in rural Anatolia, where traditional eating habits are better preserved. The gap between what Turkish food historically looks like and what Istanbul residents are actually eating has become a public health problem with a data trail.

The Fermentation Factor and the Fibre Argument

Researchers at Hacettepe University in Ankara, whose nutrition faculty is among the most cited in the region, have spent the past decade documenting the microbiome impact of fermented staples common to Istanbul street food and home cooking. Şalgam suyu — the tangy, deep-purple fermented turnip juice sold from carts around Eminönü and Kapalıçarşı — contains Lactobacillus plantarum strains that preliminary clinical trials suggest may reduce LDL cholesterol markers over a 12-week period. The sample sizes remain small, but the direction of the findings is consistent across three separate studies.

Tarhana, the dried fermented grain-and-yogurt soup base that has been a fixture of Anatolian kitchens for centuries, tells a similar story. Its fermentation process pre-digests gluten proteins and generates short-chain fatty acids that feed the gut lining. A 2024 paper in the journal Food Chemistry found that home-prepared tarhana from Gaziantep-region wheat contained significantly higher levels of these beneficial compounds than commercially packaged versions. That distinction matters for Istanbul shoppers: organic and artisanal food market Gıda Bul, which operates stalls in Kadıköy and Nişantaşı, stocks small-batch tarhana from southeastern producers at roughly 85 to 120 Turkish lira per 250-gram packet.

Olive oil is the other pillar. Turkey is the world's fifth-largest olive oil producer, and the cold-pressed extra-virgin varieties from Aegean groves near Ayvalık and Gemlik have been tested for polyphenol content in studies commissioned partly through the Istanbul Technical University food engineering department. High-polyphenol olive oil consumed at 20 millilitres per day — about one and a half tablespoons — showed measurable anti-inflammatory effects in a 16-week Turkish cohort study published in 2023. The practical implication: the dark, slightly bitter oils sold in unlabelled bottles at neighbourhood aktar (herbalist) shops in Fatih and Üsküdar tend to be higher in polyphenols than the clear, refined supermarket versions.

Putting It on Your Plate in Istanbul

The science, taken together, does not describe a complicated regime. It describes something close to a well-stocked Istanbul sofra: fresh seasonal salata with plenty of parsley and sumac, a bowl of mercimek çorbası made from red lentils, a plate of zeytinyağlı enginar (artichokes braised in olive oil), yogurt, whole-grain ekmek and a glass of şalgam on the side. The Slow Food Istanbul chapter, which runs workshops at venues in Cihangir and organises producer market days near Boğaziçi University, has been making exactly this argument since its founding in 2019 — that culinary tradition and nutritional science are converging rather than competing.

For residents wanting to engage more deliberately, Acibadem Healthcare Group's dietitian outreach clinics, available at multiple Istanbul campuses including the Maslak and Altunizade branches, now offer structured dietary assessments grounded in Mediterranean-Anatolian eating frameworks. An initial consultation runs approximately 600 to 850 lira depending on the facility. The practical starting point, researchers consistently suggest, is not a supplement or a programme but a return to the fermented, fibre-rich, olive-oil-based cooking that Istanbul's grandmothers never stopped making. The data, it turns out, has been agreeing with them for years. As always, consult a qualified local medical professional before making significant dietary changes.