What Are Enzymes and Why They Matter
If you are dealing with fatigue, sluggish digestion, bloating, or difficulty absorbing nutrients, enzymes may be playing a bigger role than you realize. Enzymes are involved in virtually every biological process in your body, from digestion and energy production to cellular repair and immune function. Without them, none of us would be here.
After 40, enzyme production naturally begins to decline, and that decline can quietly affect your digestion, energy levels, nutrient absorption, and overall health in ways that are easy to attribute to “just getting older.” So what are enzymes, what do they do, and why does supporting them matter?
What Do Enzymes Do?
All living things are made up of cells. We are composed of trillions of them. Every function our body performs begins at the cellular level, from muscles to bones to our nervous system. In order for cells to survive, they need to perform a series of chemical reactions within their membranes.
These chemical reactions are referred to as metabolism. All of the chemical reactions within the cell either start something, change something, or combine something. The end result of these reactions is referred to as a product. Our cells would not have the ability to perform these reactions and produce these products without enzymes, so they are extremely important. Not only do they allow the functions to be performed, they allow them to be performed rapidly. A lack of enzymes leads to dysfunction and disease.
What Are Enzymes Made Of?
Enzymes are made up of amino acids, which are the building blocks of protein. These building blocks can be simple (composed of whole proteins) or complex (composed of protein plus an organic molecule). Think of enzymes as energized protein molecules that act as catalysts or helpers that speed up or initiate a reaction while performing a specific activity. They have the remarkable ability to alter the speed of a chemical reaction without undergoing a permanent change in their own structure.
Each enzyme performs a specific activity or reaction. The enzyme must interact with a chemical, referred to as a substrate, and modify it to produce a different end product. Think of the enzyme as a piece of a child’s puzzle. If the enzyme is square, the substrate would also be square, so it can fit and match. You can’t put a circle substrate into a square enzyme.
Once the substrate contacts the enzyme, the substrate is modified to produce a different end product. Once this process is complete, the enzyme releases the product and is ready to do it again. Our bodies always reuse enzymes; we recycle well!
Types of Enzymes and Their Functions
Digestive Enzymes
Digestive enzymes are commonly known as protease, amylase, and lipase. They help the body digest protein, fats, and carbohydrates. They are essential for the digestive system to complete the digestive process and for nutrient absorption. They also support the liver in detoxification.
Due to the over-processing of food and cooking at high temperatures, many of the enzymes found naturally in raw food are destroyed, which creates a deficiency. A deficiency can create problems throughout the digestive system, including bloating, gas, indigestion, and poor nutrient absorption.
Energy Enzymes
Energy enzymes help our cells convert oxygen and glucose into ATP, the energy currency our cells need to function. Without these enzymes, we have no cellular energy and no functions.
Restriction Enzymes
Restriction enzymes are designed to recognize very specific patterns in DNA and have the ability to break those patterns, playing a role in cellular repair and immune function.
DNA Manipulative Enzymes
These enzymes move along our DNA strands and repair them, essential for healthy cellular reproduction and longevity.
Enzyme Production Enzymes
Yes, we even need enzymes to produce other enzymes. The body’s enzyme systems are deeply interconnected and self-sustaining when functioning properly.
What Affects Enzyme Function?
The three biggest factors that affect enzyme function are concentration (how many you have available), temperature, and pH.
Our stomach environment is highly acidic due to hydrochloric acid, and the enzymes that perform reactions in the stomach are specifically designed to handle that acidic environment. If the stomach becomes too alkaline, it can alter the shape of the enzyme, leaving it useless.
Our blood, spinal fluid, and the fluid within our cells have a neutral or slightly alkaline pH. If these environments become too acidic, the enzyme shape is also affected, leaving them unable to perform their functions.
This is why pH balance, stomach acid levels, and gut health all matter so deeply for overall enzyme function and by extension for energy, digestion, and cellular health.
The Gut Health Connection
Enzyme function and gut health are directly linked. A healthy gut environment, with the right pH, adequate stomach acid, and a balanced microbiome, is essential for enzymes to do their job properly. When the gut is imbalanced, enzyme activity is disrupted, digestion becomes inefficient, and nutrient absorption suffers.
After 40, both enzyme production and gut health tend to decline simultaneously, which is why bloating, fatigue, and digestive discomfort become so common during this phase of life. Supporting both together is far more effective than addressing one without the other.
How Enzyme Production Changes After 40
After 40 several things happen simultaneously that affect enzyme function. Stomach acid production naturally declines, which impairs the activation of digestive enzymes. The gut microbiome changes, reducing the diversity of bacteria that support enzyme activity. Chronic stress, poor diet, medications like antibiotics and NSAIDs, and exposure to environmental toxins all further deplete enzyme reserves.
The result is a body that is working harder to digest food, absorb nutrients, and produce energy, while getting less support from the very enzymes designed to make those processes efficient. This is why digestive symptoms that were never a problem in your 30s can become increasingly common after 40.
Supporting enzyme production means supporting the gut, managing stress, eating whole foods including raw and fermented foods that contain natural enzymes, and considering targeted supplementation where needed.
Frequently Asked Questions
What are enzymes, and what do they do?
Enzymes are protein molecules that act as catalysts for chemical reactions in the body. They are involved in digestion, energy production, cellular repair, immune function, and virtually every biological process that keeps you alive and healthy.
What happens when you don’t have enough enzymes?
Enzyme deficiency can lead to poor digestion, bloating, gas, nutrient malabsorption, fatigue, and, over time, can contribute to chronic health issues. The body simply cannot break down food or perform cellular functions efficiently without adequate enzyme support.
How does enzyme production change after 40?
Enzyme production naturally declines with age. Stomach acid decreases, reducing enzyme activation. Gut microbiome diversity changes. Stress, medications, and a poor diet further deplete enzyme reserves. This is why digestive symptoms become more common after 40, even in people who eat relatively well.
What affects enzyme function in the body?
The three main factors are concentration — how many enzymes you have available — temperature, and pH. When the stomach becomes too alkaline or the blood becomes too acidic, the enzyme shape is altered, and function is impaired.
How are digestive enzymes different from metabolic enzymes?
Digestive enzymes break down food in the digestive tract — proteins, fats, and carbohydrates. Metabolic enzymes work inside cells to produce energy, repair DNA, and support immune function. Both are essential, and both are affected by gut health and aging.
Can gut health affect enzyme production?
Yes, directly. A healthy gut environment with adequate stomach acid, proper pH, and a balanced microbiome is essential for enzyme activation and function. When gut health declines, enzyme activity is disrupted throughout the digestive system.
Where to Start
Understanding enzymes is the foundation for understanding why your digestion, energy, and overall health are so closely connected to what happens in your gut. For a practical guide on digestive enzymes specifically, including symptoms of deficiency, types of supplements, and how to support enzyme production naturally after 40, read our companion article on Digestive Enzymes.
You can also explore available digestive enzyme supplements from Nature’s Sunshine Products or start building the foundational habits that support your gut and enzyme health naturally with The Healthy Habits Challenge.
For further reading on enzymes, explore this plant enzyme resource from Enriching Gifts.