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Unsaturated fat
Fats, usually liquid at room temperature, linked to better heart health.
Fats
Definition
Unsaturated fats have one (mono-) or more (poly-) double bonds and are usually liquid at room temperature. Olive oil, nuts, avocado and rapeseed oil are rich in monounsaturated fat; oily fish, walnuts and seeds supply polyunsaturated omega-3 and omega-6 fats. Replacing some saturated fat with unsaturated fat is associated with lower cardiovascular risk. They are still energy-dense at about 9 kilocalories per gram, so portions matter.
Related terms
Saturated fat
A fat type, solid at room temperature, best kept to a modest share of energy.
Cholesterol
A waxy blood lipid; the LDL/HDL balance matters more than the total.
Calorie
A unit of food energy; the "calorie" on labels is really a kilocalorie.
Source: Standard dietary-fat guidance from public-health references. · checked 2026-09-04
Frequently asked questions
What is unsaturated fat?
Unsaturated fats have one (mono-) or more (poly-) double bonds and are usually liquid at room temperature. Olive oil, nuts, avocado and rapeseed oil are rich in monounsaturated fat; oily fish, walnuts and seeds supply polyunsaturated omega-3 and omega-6 fats. Replacing some saturated fat with unsaturated fat is associated with lower cardiovascular risk. They are still energy-dense at about 9 kilocalories per gram, so portions matter.
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