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Breakfast with hazelnut spread

29 July 2026 · 8 min

Hazelnuts, metabolism and heart health

Oleic acid and fibre in the cardiometabolic literature; a summary free of exaggeration.

The link between nut consumption and cardiovascular health is one of the most studied topics in nutrition science. Large cohort studies observe more favourable risk markers among regular nut eaters, and hazelnuts are an important part of that literature.

Oleic acid and the lipid profile

Monounsaturated fats such as oleic acid are treated in dietary guidelines as sources that can replace part of saturated fat intake. Controlled studies consistently report the favourable effect on LDL cholesterol when monounsaturated fat substitutes for saturated fat.

Fibre improves diet quality through possible effects on LDL cholesterol and glycaemic load management. Hazelnuts deliver fibre, polyphenols and phytosterols in one practical package.

In-shell hazelnuts on a white surface
Natural, minimally processed forms deliver the same nutrient profile without salt and sugar loads.

Portion and context

Salted and sugar-coated products can change the health equation; sodium and added sugar claw back part of the advantage. The simplest rule: prefer natural or lightly roasted product and keep the portion to a handful.

Individuals differ by medical condition and medication. This article is for information only and is not personal medical advice.