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# Lipids

lip·ids - LIP-idz

## Definition

Lipids are a broad group of naturally occurring organic molecules that include fats, oils, waxes, sterols (like [cholesterol](/glossary/cholesterol)), and fat-soluble vitamins (A, D, E, K). In the context of health and medicine, 'lipids' most commonly refers to the fats circulating in your blood - primarily cholesterol and [triglycerides](/glossary/triglycerides) - that are measured in a standard lipid panel blood test.

Lipids serve essential biological functions. They are the primary component of cell membranes, providing structure and flexibility. They serve as concentrated energy storage (fat stores more than twice the energy per gram compared to carbohydrates or protein). They insulate organs and nerves. They are precursors to [hormones](/glossary/hormone) (steroid hormones are made from cholesterol). And they enable the absorption of fat-soluble vitamins.

A lipid panel - one of the most commonly ordered blood tests - measures total cholesterol, LDL cholesterol ('bad' cholesterol that contributes to plaque buildup in arteries), HDL cholesterol ('good' cholesterol that helps remove LDL from the bloodstream), and triglycerides. Abnormal lipid levels (dyslipidemia) are a major risk factor for [cardiovascular](/glossary/cardiovascular) disease, and lipid management through diet, exercise, and medications (particularly statins) is one of the cornerstones of heart disease prevention.

## Also Known As

Fats Blood fats 

## Key Facts

-   • A standard lipid panel measures total cholesterol, LDL-C, HDL-C, and triglycerides. 
-   • Desirable levels: total cholesterol <200, LDL <100, HDL >60, triglycerides <150 mg/dL. 
-   • Fat provides 9 calories per gram - more than double the 4 calories per gram from carbohydrates or protein. 
-   • Cholesterol is so important that the body produces about 80% of its own cholesterol in the liver. 
-   • Statins - cholesterol-lowering medications - are among the most prescribed drugs worldwide, taken by over 200 million people. 

## How It Relates To Your Health

Regular lipid testing is recommended for adults starting at age 20, with frequency based on risk factors. Abnormal lipid levels significantly increase cardiovascular risk, and your doctor may recommend dietary changes (reducing saturated and trans fats, increasing fiber and [omega-3s](/glossary/omega-3-fatty-acids)), exercise, weight management, and potentially statin medications.

Understanding your lipid numbers in context is important - a single elevated LDL is less meaningful than your overall cardiovascular risk profile, which includes [blood pressure](/glossary/blood-pressure), blood glucose, smoking status, family history, and inflammatory markers like hs-CRP. Modern guidelines increasingly use 10-year [cardiovascular](/glossary/cardiovascular) risk calculators to guide treatment decisions.

## Related Terms

[Cholesterol](/glossary/cholesterol)[Triglycerides](/glossary/triglycerides)[Atherosclerosis](/glossary/atherosclerosis)[Omega-3 Fatty Acids](/glossary/omega-3-fatty-acids)[Saturated Fat](/glossary/saturated-fat)

## Related Articles

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### The Mediterranean Diet: A Complete Beginner's Guide

2026-01-20

## Sources

1.  [Lipid Panel](https://medlineplus.gov/lab-tests/lipid-panel/) - MedlinePlus (NIH)
2.  [Cholesterol Levels](https://www.heart.org/en/health-topics/cholesterol/about-cholesterol/what-your-cholesterol-levels-mean) - American Heart Association
3.  [Dyslipidemia](https://www.ncbi.nlm.nih.gov/books/NBK305896/) - StatPearls / PubMed

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