Hazelnut has been cultivated and gathered across Southeastern Europe and Western Asia for thousands of years, with Turkey remaining by far the world's largest producer today. Hazelnuts held real cultural significance across ancient Greek and Roman society and later European folklore, sometimes associated with wisdom and protection.
Hazelnut's modern research profile has received comparatively less scientific attention than walnut or almond despite a genuinely solid, consistent evidence base for cardiovascular markers.
Hazelnut has a genuinely consistent evidence base for cholesterol, confirmed across multiple independent reviews. A Bayesian meta-analysis of 9 studies (425 participants) found hazelnut-enriched diets significantly reduced LDL cholesterol. A separate systematic review of 22 intervention studies similarly found hazelnut-enriched diets associated with reductions in total cholesterol and LDL. A randomized controlled trial in hypercholesterolemic men found significant improvements in cholesterol alongside a 56.6% improvement in flow-mediated dilation.
A large network meta-analysis directly comparing five nut types found hazelnut performed favorably among them, though pistachio and walnut ranked marginally higher for some specific measures. Consistent with other nuts, HDL cholesterol and triglycerides showed no significant change. Given multiple independent meta-analyses all confirming the same reduction, comparable in consistency to walnut, almond, and pistachio, "Moderate-Strong" is the accurate rating.
Eaten raw or roasted, shelled; ground into paste or flour for confections and baking across Mediterranean and Central European cuisine.