What Fatigue Means

Are you tired all the time? Do you get that fatigue feeling? What does fatigue even mean?

Fatigue is the most common symptom that I see in my clients. If they come in with an GI issue, they are also fatigued. Do they come to me wanting to lose weight? They are also fatigued. Do they struggle with depression or anxiety? They also are fatigued. Do they want to clear their skin form eczema in time for summer? They also are probably fatigued. 


Fatigue, exhaustion, tired…it’s all the same. And it means something.


Fatigue is a sure sign of deeper issues. And is often one of the first symptoms people will notice when their body starts to struggle. Don’t ignore your fatigue! 


At it’s very basic level fatigue means that the body isn’t making energy. More specifically, the cell can’t create energy. Your cells are designed to produce energy in the form of ATP (adenosine triphosphate). ATP is an energy-carrying molecule that is found in all living things. Guess what drives the production of ATP? Three molecules that we call fat, carbohydrates, and protein. 

In order to understand fatigue we need to understand how the body is energized, so let's think about your local power plant that creates electricity for your entire city.


Think of ATP as the power going through your body to energize everything, sort of like the electricity that goes through the walls in your house to power all the rooms. This energy in your body does more than help you play soccer with your kids. It give energy to your digestive system to break down the scrambled eggs you had this morning and it energizes your brain to remember to order a Target pick-up for toilet paper. It also gives your cells energy to repair the body when you bump into the counter with your arm or get a cold. ATP even gives the lungs energy to automatically breathe in and out. It IS the currency of energy that gives energy to literally every function of the body.


That energy is generated somewhere, right? Absolutely. Your cell generates ATP in a little part of the cell called the mitochondria. It’s sort of like the power plant in the city you live. But that power plant for your community doesn’t generate power out of thin air. They probably use some sort of fuel. (Hopefully you can see where this is going) They use coal or gas or wind or water or maybe nuclear energy. Your cells take in fuel to create energy too, and that fuel comes from the nutrients  (primarily fat, carbohydrates, and protein) you give your body. 


So what does fatigue mean?


It means that somewhere along the process of the body making energy there was a problem, and the result is lower (or no) production of energy. Imagine if there was no fuel. There would be no energy. What if the power plant shuts down? There would be no energy. Or the workers go on strike? There would be no energy. Or the powerlines that take energy to your house get struck by lightning? There would be no energy. All of those issues would break the flow of energy. The same thing happens with your body. Not giving the cell proper nutrients can prevent it from getting the fuel it needs to create ATP. Problems in the cell (like viruses) can prevent the ATP from getting distributed around the body. The brain, through your fight or flight response, can tell the cells to change priorities. There are also multiple reasons that the mitochondria (the power plant) can shut down or get destroyed. 


Simply put: Fatigue means you have a problem along the energy production line of the body. 


So do you have this problem? If you constantly say “I’m so tired!’ chances are, you do. 


There are three root causes of fatigue that I outline in my
Take Back My Energy Quick Guide. If you want to see which root cause your body deals with most, download the guide to take the assessment, learn about the causes, and create your plan for healing. 


I’ve helped hundreds of clients with their original health complaint AND their fatigue. Don’t go another day without taking back your energy.


Don't Miss Out!

Heidi Toy Functional Medicine Blog

By Heidi Toy June 14, 2025
Did you know most people didn’t have refrigerators in their homes until well into the 1900’s? It wasn’t even invented for large scale commercial use until the mid 1800’s [1]. So how did people keep their milk cold and make their food last longer? Fermentation. It sounds like a gross concept, because we often associate fermentation with a bad odor, but foods like cheese, yogurt, sauerkraut and pickles are all fermented foods. And those aren’t gross, are they? Well, some might disagree with me about sauerkraut, but that’s beside the point. Fermented foods are digestive aids. Microscopic living organisms in fermented foods help extend the food’s shelf life, enhance flavor, and help the body absorb minerals. These organisms pre-digest the food, getting rid of harmful components, and create more vitamins and enzymes than the food began with. Enzyme-rich foods have many benefits including [2]: Increase digestibility of food we eat Boost immune system Increase alkalinity; neutralizing pH levels Provide a healthy balance of friendly flora in the gut (Learn more about your microbiome in my other blog posts ) Tone the colon and help with elimination Control cravings for unhealthier foods Eliminate toxins and undigested wastes in the body In the “old days,” people use to ferment all kinds of foods through pickling, canning, pasteurization and added salt. Nowadays, however, large scale fermentation has lost many of its nutritious benefits due to the need for speed to get the product on the shelf as fast as possible and as cheap as possible. The only true fermented foods you will find are sauerkraut, kombucha, yogurt and kefir, beans, wine and beer, some meats (such as salami and pastrami), legumes and nuts (such as tofu, soy sauce and miso), sourdough bread, and various kinds of vegetables [3]. Fun facts about sauerkraut: The Germans “stole” it from the Chinese! Sauerkraut (probably not labeled as such for the Chinese, but the same recipe) was one of the main foods for those who built the Great Wall of China. Genghis Khan brought it to Eastern Europe during an invasion. It also contains high levels of vitamin C, and sailors often took it on long journeys to prevent scurvy.
By Heidi Toy May 14, 2025
How can we best keep blood sugar stable? Do what our body is designed to do – use fat for energy. Our species did not survive the Ice Age because of vanilla coffee lattes and cheesecake. Throughout most of our history, we ate a diet that was likely 50-70 percent fat. Look at the old family photo albums, specifically pictures of people in the first half of the 1900s, before we had so many processed foods. You won’t see many fat people--in fact, most look darn skinny. If they lived on the farm, they ate lots of eggs, meat, milk, and vegetables out of their own backyards. “Diet foods” were non-existent. Heart disease was almost non-existent. Our metabolism is designed to work much better with fats better than with sugar. Fats provide the slow and steady fuel our body likes to use for energy. Think of fats as a slow-burning log on the fire. One log (i.e. one meal containing fats) lasts for hours. Starchy carbs, on the flip side, are like kindling. You constantly have to throw more twigs (chips, pasta, bagels) to keep the fire burning. The first step is to know your sugars by reading the labels, and then avoid said sugars as much as possible.
By Heidi Toy May 1, 2025
How Stabilizing Blood Sugar Can Help Put Autoimmune Conditions into Remission and Promote Healing
By Heidi Toy April 14, 2025
Omega-3 and Omega-6 are considered “essential” fatty acids because they cannot be produced by the body--we get them from the food we eat. They are biologically active upon ingestion, which means the body utilizes them right away and cannot store them up for later. They are essential because they help with both inflammatory and anti-inflammatory responses.
By Heidi Toy March 14, 2025
Kill the Candida!
By Heidi Toy March 14, 2025
Hangover or Too Much Yeast?
By Heidi Toy March 10, 2025
Food Cravings Explained: The Hidden Causes of Sugar, Salt, and Carb Cravings (and How to Take Control)
By Heidi Toy February 28, 2025
Why Did I Get Candida and How Can I be Sure?
By Heidi Toy February 17, 2025
Discover How CoQ10 Supports Heart Health, Energy Levels, and More—Especially During Heart Health Month.
Candida yeast overgrowth
By Heidi Toy February 14, 2025
Good Yeast, Bad Yeast
More Posts