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Saturated vs unsaturated fat: what's the difference?

How the two fat types differ, which foods contain them and how to choose for your macros.

Written by Updated 7 min read

Saturated fat has no double bonds in its chemical structure and is usually solid at room temperature, like butter. Unsaturated fat has one or more double bonds and is usually liquid, like olive oil. Both have about 9 calories per gram, but unsaturated fats are generally better for cholesterol and heart health. Set your total fat with the macro calculator, based on your calories from the TDEE calculator, then choose the types.

Infographic: Saturated vs unsaturated fat. Swap some saturated fat for unsaturated. Calories stay the same.
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At a glance

SaturatedMonounsaturatedPolyunsaturated
StructureNo double bondsOne double bondTwo or more double bonds
Usually at room temperatureSolidLiquidLiquid
Example foodsButter, cheese, fatty meat, coconut oilOlive oil, avocado, almondsFish, walnuts, sunflower and canola oil
Calories per gram999
Effect on LDL when it replaces saturated fatReferenceLowersLowers

Most foods contain a mix. Butter is mainly saturated but not only; olive oil is mainly monounsaturated but contains some saturated fat.

What a tablespoon of common fats contains

Fat or oil (1 tbsp)SaturatedMonoPolyCalories
Coconut oilabout 11.2 gabout 0.8 gabout 0.2 gabout 121
Butterabout 7.3 gabout 3.0 gabout 0.4 gabout 102
Olive oilabout 1.9 gabout 10 gabout 1.4 gabout 119
Canola oilabout 1.0 gabout 8.9 gabout 4.1 gabout 124

Values are rounded from USDA data and vary slightly by source. Notice that the calories are similar; the difference is the mix. A tablespoon of olive oil uses less than a tenth of a 22 g saturated fat limit, while a tablespoon of coconut oil uses about half. See the full list in foods high in saturated fat.

What the evidence says

Saturated fat raises LDL ("bad") cholesterol compared with unsaturated fat, which is why guidelines advise limits. A 2020 Cochrane review of 15 randomised trials covering about 56,700 adults found that cutting saturated fat lowered combined cardiovascular events by about 17 percent, with effects on total mortality small or absent. The benefit appeared when saturated fat was replaced with polyunsaturated fat or carbohydrate rather than with other saturated or unclear sources.

  • US Dietary Guidelines: under 10% of calories from saturated fat.
  • American Heart Association: under 6% of calories.
  • Trans fat: eliminate industrial trans fats (WHO).

The practical lesson is about swaps: the quality of what replaces saturated fat matters. See how much saturated fat per day is OK.

Plan your fat macros

Example: 2,200 calories with 30% from fatFat = 2,200 × 0.30 ÷ 9 = 73 g. A 10% saturated limit is 2,200 × 0.10 ÷ 9 = 24 g, so about a third of your fat can be saturated at most, and the rest should come from olive oil, nuts, avocado and fish.
  1. Set total fat from your macro split. If you are unsure, see macro splits explained.
  2. Cap saturated fat at your chosen limit.
  3. Fill the rest with mono- and polyunsaturated sources, including oily fish twice a week.
  4. Read labels for the saturated line (how to read a nutrition facts label).

Common myths

  • "Fat makes you fat." Calories do. Fat is calorie-dense, so portions matter (portion control).
  • "Low fat is always better." You need some fat for health, and very low-fat diets are hard to sustain.
  • "Coconut oil is a health food." It is high in saturated fat and counts toward the limit.

Start with what are macros if you are new to fat targets.

Set your total fat grams, then choose mostly unsaturated sources.

Open the macro calculator

Frequently asked questions

What is the difference between saturated and unsaturated fat?
It is chemical. Saturated fats have no double bonds in their fatty acid chains and are usually solid at room temperature. Unsaturated fats have one (monounsaturated) or more (polyunsaturated) double bonds and are usually liquid.
Which is healthier?
Unsaturated fats are generally preferred. Replacing saturated fat with unsaturated fat lowers LDL cholesterol, and a Cochrane review found fewer cardiovascular events when saturated fat was reduced, particularly when replaced with polyunsaturated fat.
Are all saturated fats bad?
The effect depends on the food and what replaces it. Saturated fat from dairy, meat and tropical oils counts toward the same limit, but whole foods such as yoghurt or fish also bring other nutrients. The advice is to keep total saturated fat in range, not to ban it.
Are trans fats unsaturated?
Yes, but they are the harmful exception. Industrial trans fats have a chemical shape that raises LDL and lowers HDL. WHO recommends eliminating them from the diet.
Do I need both?
Your body needs some fat, including essential unsaturated omega-3 and omega-6 fats. It can make saturated fat itself, so there is no requirement to eat it.

Keep reading

Foods high in saturated fatWith amounts.Saturated fat per dayLimits explained.What is a balanced diet?A plate model.

Sources

  1. Hooper L, Martin N, Jimoh OF, Kirk C, Foster E, Abdelhamid AS. Reduction in saturated fat intake for cardiovascular disease. Cochrane Database Syst Rev. 2020;(8):CD011737. cochrane.org/evidence/CD011737.
  2. American Heart Association. Saturated fats. heart.org.
  3. U.S. Department of Agriculture and U.S. Department of Health and Human Services. Dietary Guidelines for Americans, 2025–2030. Released January 2026. dietaryguidelines.gov.
  4. World Health Organization. Healthy diet (fact sheet). who.int/health-topics/healthy-diet.
  5. U.S. Department of Agriculture, Agricultural Research Service. FoodData Central. fdc.nal.usda.gov. Values in this guide are rounded from USDA entries for the foods named; brands and preparation change them.