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# Enzyme

en·zyme - EN-zyme

## Definition

An enzyme is a specialized protein that acts as a biological catalyst - it speeds up chemical reactions in the body without being consumed or permanently changed in the process. Virtually every chemical reaction in your body requires an enzyme to proceed at a rate fast enough to sustain life. Without enzymes, the biochemical reactions needed for digestion, energy production, DNA replication, immune defense, and thousands of other processes would occur far too slowly to support living organisms.

Enzymes work with remarkable specificity. Each enzyme [has](/glossary/hyaluronic-acid) a unique three-dimensional shape with an 'active site' that fits only specific molecules (called substrates) - much like a lock and key. When the substrate fits into the active site, the enzyme facilitates a chemical transformation, then releases the product and is ready to repeat the process. A single enzyme molecule can catalyze thousands of reactions per second.

The human body produces thousands of different enzymes, each designed for a specific task. Digestive enzymes (like amylase, protease, and lipase) break down food. Metabolic enzymes manage energy production and cellular maintenance. Liver enzymes process drugs and [toxins](/glossary/toxin). DNA polymerase copies your genetic material. Enzymes require specific conditions - including proper pH, temperature, and often helper molecules called cofactors (many of which are [vitamins and minerals](/glossary/micronutrients)) - to function optimally.

## Also Known As

Biological catalyst 

## Key Facts

-   • The human body produces thousands of different enzymes, each catalyzing a specific chemical reaction. 
-   • Enzyme names typically end in '-ase' (e.g., lactase, lipase, amylase, protease). 
-   • Many vitamins and minerals function as enzyme cofactors - essential helpers without which enzymes cannot work. 
-   • Enzyme deficiencies cause various genetic disorders, such as lactose intolerance (lactase deficiency) and phenylketonuria (phenylalanine hydroxylase deficiency). 
-   • Elevated liver enzymes (ALT, AST) in blood tests can indicate liver inflammation, damage, or disease. 

## How It Relates To Your Health

Enzyme levels in blood tests are commonly used diagnostic tools. Elevated liver enzymes (ALT and AST) may indicate hepatitis, fatty liver disease, or medication-related liver damage. Elevated cardiac enzymes (troponin, CK-MB) are used to diagnose [heart attacks](/glossary/myocardial-infarction). Pancreatic enzyme levels (amylase and lipase) help diagnose pancreatitis.

Enzyme-related therapies are also important in medicine. Enzyme replacement therapy is used for conditions like Gaucher disease and Fabry disease. Digestive enzyme supplements can help people with pancreatic insufficiency or specific enzyme deficiencies like lactose intolerance. Many pharmaceutical drugs work by inhibiting specific enzymes - for example, ACE inhibitors block an enzyme involved in [blood pressure](/glossary/blood-pressure) regulation.

## Related Terms

[Amino Acid](/glossary/amino-acid)[Metabolism](/glossary/metabolism)[Detoxification](/glossary/detoxification)[Peptides](/glossary/peptides)

## Related Articles

[![Intermittent Fasting: What the Science Actually Says](https://images.unsplash.com/photo-1504674900247-0877df9cc836?w=1200&h=630&fit=crop&fm=webp)](/nutrition/intermittent-fasting-science)

[](/nutrition/intermittent-fasting-science)[Nutrition & Diet](/nutrition)

### Intermittent Fasting: What the Science Actually Says

2025-09-01

## Sources

1.  [Enzymes](https://www.ncbi.nlm.nih.gov/books/NBK554481/) - StatPearls / PubMed
2.  [Enzymes](https://medlineplus.gov/ency/article/002353.htm) - MedlinePlus (NIH)
3.  [How Enzymes Work](https://www.khanacademy.org/science/ap-biology/cellular-energetics/enzyme-structure-and-catalysis/a/enzymes-and-the-active-site) - Khan Academy

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