Liver health and blood sugar are more connected than most people realize. Your liver helps manage glucose between meals and while you sleep, and it also plays important roles in insulin regulation, fat and cholesterol metabolism, bile production, and energy storage.
So if your fasting glucose or insulin is creeping up, triglycerides and HDL are changing, blood pressure is higher than expected, your waistline is expanding, or your energy feels less steady, I do not look at those changes as isolated problems. I get curious about the larger metabolic pattern, and the liver deserves a seat at that table.
Most people hear “liver” and think alcohol or detox. Those matter, but they are only part of the story. I often call the liver your metabolic COO because it helps coordinate so many day-to-day metabolic operations. It is not the only player, but it is involved in a lot of the communication happening behind the scenes.
PART 1 OF A 3-PART SERIES
Today: Why your liver matters for blood sugar, insulin, energy, and weight.
Part 2: What bloodwork, DUTCH hormone testing, gut testing, genetics, medications, and supplements can and cannot tell us.
Part 3: Why understanding what to do is not the same as doing what you need to do, and how to turn information into sustainable action.
Your Liver Is Much More Than a “Detox” Organ
Think about the COO of a company. That person does not perform every job, but they help keep daily operations moving. Your liver plays a similar coordinating role in metabolism.
Among many other jobs, your liver helps process nutrients, stores and releases fuel, participates in fat and cholesterol metabolism, produces bile, participates in hormone metabolism, metabolizes alcohol and many medications, and transforms compounds so they can move toward elimination.
Detoxification is one department. Your metabolism is the company.
That is an important distinction. Stubborn belly fat, fatigue, or a higher fasting glucose can have many possible influences. Rather than assigning one cause to a symptom, I use those changes as a reason to ask better questions about the larger metabolic picture.
In an earlier blog, Liver Detox Myths: Why Quick Cleanses Fail and What Really Works, I talked about why a short cleanse is not the same thing as supporting your liver and metabolic health over time.
How Liver Health and Blood Sugar Connect
Here is the simple version: your liver helps make sure glucose is available when you need it and stored when you do not need all of it right away.
After you eat
Glucose from food enters the bloodstream. Insulin acts as a messenger telling your cells and liver that fuel is available. Your liver can store some glucose as glycogen, a stored form of carbohydrate, and reduce how much glucose it releases into circulation.
Think of glycogen as part of your short-term fuel reserve. You eat, some fuel is used, and some can be put away for later.
Between meals and while you sleep
Eating is not the only thing that affects blood sugar. You may go eight, ten, or more hours overnight without food, but your brain and other tissues still need fuel. Your liver helps keep glucose available. Early in a fast, it can break down stored glycogen. As fasting continues, it can also make new glucose from other building blocks.
So why does your liver release glucose? Because that is literally part of its job.
The issue is not that the liver makes glucose. The question is whether glucose production and storage are responding appropriately to the body’s signals. The liver is central to glucose metabolism and insulin clearance, and hepatic insulin resistance, meaning the liver is not responding as effectively to insulin’s signals, can contribute to glucose production that is higher than the body needs. [1]
Why Can Fasting Blood Sugar Be High When You Have Not Eaten?
“I have not eaten since dinner. Why is my glucose higher this morning?”
I love this question because it reminds us that food is only one part of blood sugar regulation.
One way to picture insulin is as part of the traffic-control system. When enough fuel is available, insulin helps signal the liver to slow glucose output. With insulin resistance, that signal may not work as effectively. The liver can continue releasing more glucose than is needed even when glucose is already available.
I would not assign one morning glucose value to one cause. Cortisol normally follows a daily rhythm and rises toward the morning, with an additional rise around awakening. The previous evening’s meal and timing, alcohol, sleep, exercise, medications, stress and recovery, and the person’s broader metabolic health can all add context.
A data point gives me a number. A pattern gives me a better question.
That is how I want you to think about your own data too: curiosity before conclusions.
Watch our full conversation below
When Glucose Looks “Normal” but Insulin Is Working Harder
This is one pattern I pay close attention to when reviewing bloodwork. Fasting glucose and A1C may still look reassuring while fasting insulin, when it is measured, is higher than expected or trending upward.
That can happen because the body is producing more insulin to help keep glucose under control. The glucose number may still look okay while the body is working harder behind the scenes.
Fasting insulin by itself does not determine whether someone has insulin resistance. I use fasting insulin as one additional metabolic data point, alongside glucose, A1C, triglycerides, HDL, waist circumference, health history, and other relevant information. Plus, your licensed healthcare professional will conduct a medical evaluation to consider the full clinical picture as well.
You may also notice a big difference between a laboratory’s standard reference range and what some functional and metabolic-health practitioners consider an optimal range. In my work, I often use approximately 2–5 µIU/mL as an optimal lens for fasting insulin, while recognizing that this is not a universal medical cutoff. Different laboratories use different testing methods and reference ranges. That is one reason I care about the pattern and trend, not one number in isolation.
A lab result appearing “green” does not automatically answer every health question. I do not stop at whether the report shows green or red. I look at the number, the trend, the person, and how the markers relate to one another.
I also pay attention to triglycerides and HDL individually and to their relationship. The triglyceride-to-HDL ratio has been associated with insulin resistance and cardiometabolic risk, but it is one piece of a larger metabolic pattern, and useful thresholds can vary across populations.
I go deeper into these kinds of patterns in my blog 10 Early Patterns Often Linked to Insulin Resistance You Can Spot at Home, where I walk through practical signs that may be worth paying attention to without assuming one symptom tells the whole story.
Where Belly Fat and Liver Fat Can Connect
You do not need an expensive body-composition scan to start gathering useful information. Measure your waist. It is simple, inexpensive data that can add context to BMI and cardiometabolic risk. A major consensus statement recommends waist circumference as a useful clinical measure because it provides risk information beyond BMI alone. [2]
Visceral fat is stored deeper in the abdomen around internal organs. It behaves differently from the subcutaneous fat you can pinch under the skin and is strongly associated with cardiometabolic risk.
Fat can also accumulate inside the liver. The current term for fatty liver disease associated with metabolic dysfunction is metabolic dysfunction-associated steatotic liver disease, or MASLD. You do not need to memorize the acronym. What matters is that MASLD commonly overlaps with abnormal blood sugar regulation, central adiposity, which simply means carrying more fat around the waist or belly, high blood pressure, and dyslipidemia, meaning unhealthy cholesterol or triglyceride patterns. [3]
Your waist, glucose, triglycerides, and liver markers are not competing for attention. They may be telling different chapters of the same metabolic story.
That does not mean belly fat equals liver fat. It means insulin resistance, belly fat, liver fat, lipid metabolism, sleep, physical activity, alcohol, medications, genetics, and other factors can interact. Think feedback loop, not single cause.
“But My Liver Enzymes Are Normal”
Good. Normal AST and ALT are useful information. I just do not let two numbers tell me the entire story.
AST and ALT are enzymes commonly included on bloodwork to help assess liver health. It is possible for these numbers to stay within the laboratory range even when someone has meaningful liver fat or liver scarring, called fibrosis. Current liver guidelines recommend looking at the broader cardiometabolic picture rather than relying on AST and ALT alone. [3,4]
For people with certain risk factors, a physician may use FIB-4, a calculation that combines age, AST, ALT, and platelet count to estimate the likelihood of more advanced liver scarring. A physician may also use imaging-based tools such as elastography, which measures liver stiffness. These are medical assessment tools used in the appropriate clinical setting.
When I review someone’s metabolic picture, I look for relationships. Depending on the person and the data available, that may include AST, ALT, GGT, alkaline phosphatase, bilirubin, platelets, fasting glucose, A1C, triglycerides, HDL, fasting insulin when appropriate, blood pressure, waist circumference, alcohol intake, medications and supplements, diet, activity, sleep, recovery, symptoms, and health history.
hs-CRP can add information about systemic inflammation and cardiovascular risk, but it is not a liver-function marker. GGT can add useful liver or biliary context in certain situations, but it is not simply an “alcohol test” or a measure of how well someone “detoxes.”
I talked about this years ago in my podcast episode Liver Markers You Don’t Want to Miss and Functional Blood Chemistry. Some of my terminology and conclusions have evolved as I have continued studying the research and working with clients, but one principle has stayed with me: blood markers make more sense in context than in isolation.
A Flat CGM Curve Does Not Automatically Mean a Healthy Response
I love being my own guinea pig, especially when I can use my own data to demonstrate physiology we see in the research or test a health claim that is circulating online. My continuous glucose monitor, or CGM, gives me one way to do that.
In one experiment, I first tested wine by itself. On another day, I had wine with sweet potato fries, a carbohydrate-rich food that would normally be more likely to raise my glucose. I wanted to see whether the effect of alcohol described in research would show up in my own CGM data. The wine-plus-fries glucose curve stayed surprisingly flat.
If I had treated the CGM like a food-grading report card, I could have looked at that line and thought, “Wow, my body handled those fries really well.” That would have missed important physiology happening behind the scenes.
Alcohol changes liver metabolism and can temporarily suppress gluconeogenesis, the process of making new glucose. A CGM measures glucose in the fluid around your cells. It does not measure insulin, liver fat, alcohol metabolism, or sleep quality. I did not measure my insulin during that experiment, so I cannot tell you what happened to it.
What did the CGM tell me? My glucose pattern. That is useful. What did it not tell me? Everything else happening metabolically behind the scenes. A flatter glucose curve does not automatically mean a healthier metabolic response.
That distinction is exactly why I like data. Not because one device or one number gives us the answer, but because good data can help us ask better questions and better understand our own bodies. When we can see patterns more clearly, we can be more proactive, make adjustments, and course correct instead of continuing to guess.
That is a big part of what I do as a functional health coach and practitioner. I help clients assess what is happening, evaluate the information in the context of their health, lifestyle, and goals, and decide what may be worth changing. We implement, observe how the body responds, and course correct as needed.
Alcohol also affects sleep. A recent systematic review and meta-analysis found that alcohol can disrupt sleep architecture, including REM sleep, with greater disruption at higher doses. [5] Feeling sleepy after a drink and getting better physiological recovery are not the same thing.
Now, I am going to guess this is not news to many of you. If you wear a device that tracks your sleep and/or HRV, you may have already seen a difference in your own data after drinking alcohol. If you do not track anything, pay attention to how you actually feel the next morning. How did you sleep? How is your energy? Do you feel recovered?
Sometimes we do not need another piece of information. We just need a reminder to connect the dots between what we already know and what our body keeps showing us.
Action Steps: Choose Your Next Best Move
Please do not finish this blog and decide you need a giant lab panel, five functional tests, or another liver supplement. More data are not automatically better data.
This is where my Investigate → Integrate → Implement approach matters. First, gather information that answers a useful question. Then integrate it with your history, symptoms, goals, lifestyle, and other data. Only then decide what is worth implementing.
And you do not have to figure all of that out on your own. Part of my role as a coach is to guide you through that decision-making process so you can focus on what matters most, take action, and course correct as your body responds.
You do not need to order every test or overhaul your routine this week. Start with the information you already have, choose the action step that is most relevant to you, and use it to ask a better question.
| Choose This If… |
Your Action This Week |
What to Watch |
| Your bloodwork keeps coming back “normal,” but your weight, energy, or metabolic health still feels off |
Pull up your most recent labs. Find fasting glucose, A1C, triglycerides, HDL, AST and ALT. Note what was measured and what was not. Do not stop at whether the report looks green or red. |
Look for the pattern, not just individual flags. What numbers are changing over time? What information might be missing? |
| Belly fat has become harder to lose, especially around your waist |
Measure your waist circumference and record it. Repeat it under similar conditions in about 4 weeks. |
Watch the trend rather than reacting to one number. Waist circumference adds another piece of information about belly fat and cardiometabolic risk. |
| Your morning glucose is higher than you expect, even though you did not eat overnight |
If you already measure glucose, track it for 7 mornings. Also note dinner timing, evening exercise, alcohol, and how well you slept. |
Look for repeatable relationships, not one unusual glucose reading. The goal is to identify better questions about your pattern. |
| You regularly use alcohol to unwind, socialize, or help yourself fall asleep |
Choose several alcohol-free evenings this week. If you already use a wearable or CGM, compare those nights with your usual routine. |
Pay attention to sleep quality, recovery, morning energy, and glucose if available. Feeling relaxed after drinking is not necessarily the same as recovering better. |
Next: What Can DUTCH, Gut Testing, Genetics, and Other Data Really Tell Us?
Once people realize AST and ALT are not the only pieces of the puzzle, the next thought is often, “Maybe I just need more testing.”
Not necessarily. Every test answers a different question.
Other types of information can add more pieces to the picture. Hormone metabolites are the breakdown products created as your body processes hormones, and they can be measured through specialized testing such as DUTCH. β-glucuronidase is an enzyme produced by certain gut bacteria that can affect whether some compounds headed toward elimination get released again in the gut. Genetics can add information about inherited tendencies, while diet, alcohol, lifestyle, medications, and supplements add important context.
None of these pieces, by themselves, tells us how well your liver “detoxes.” Each answers a different question. In Part 2, I will show you what tests such as DUTCH, genetics, and stool testing can and cannot tell us.
Medications matter too. I do not prescribe medications or tell clients to change them, but I do want to know what someone is taking when we are evaluating health data and patterns. Certain medications can influence glucose, lipids, weight, liver markers, nutrient status, and other measurements. When something deserves further attention, that information can help the client have a more informed conversation with the prescribing physician.
Want to Go Deeper? Watch My Conversation with Courtney
If you prefer listening or watching, Courtney and I had a broader conversation about liver health, detox pathways, gut health, metabolism, testing, and the everyday choices that influence how these systems work together.
We cover more than I could reasonably fit into this blog, so if this topic has you curious, you can watch our full conversation below.
Frequently Asked Questions
Can my liver markers look normal even when my metabolic health needs attention?
Yes. AST and ALT are useful liver-related enzymes, but they are only two pieces of a much larger metabolic picture. Blood sugar, triglycerides, HDL, blood pressure, waist circumference, alcohol intake, medications, sleep, activity, and health history can add important context. Trends across several markers often tell us more than whether two numbers fall inside a laboratory reference range. [3,4]
Does belly fat tell me anything about my liver or metabolic health?
Belly fat, especially a growing waist circumference, can be a useful signal of higher cardiometabolic risk. It does not tell you what is happening inside your liver by itself. I use waist circumference as one accessible data point and look at it alongside blood sugar, triglycerides, blood pressure, activity, sleep, alcohol, medications, and other relevant information. [2,3]
What blood markers can add context when I am trying to understand my metabolic health?
Common starting points include fasting glucose, A1C, triglycerides, HDL, AST and ALT. GGT may add liver or biliary context in some situations, and I sometimes use fasting insulin as an additional metabolic data point when available. The most useful markers depend on the person and the question being asked, so I focus on patterns, trends, and context rather than one universal panel.
Your Liver Is Part of the Metabolic Conversation
Your liver does not need to become the new thing you blame for every symptom. And it does not need a trendy seven-day reset.
It deserves to be understood as part of a larger system. Blood sugar, insulin, triglycerides, waist circumference, blood pressure, liver-related markers, sleep, alcohol, medications, nutrition, and activity can all give us pieces of information. The value comes from knowing which pieces matter for you and how they fit together.
Your bloodwork says “normal,” but are you wondering if there is more to the story?
If this blog has you curious about Functional Blood Chemistry Analysis (FBCA), optimal ranges, and looking at bloodwork as a pattern rather than isolated numbers, schedule a complimentary 20-minute FBCA Bloodwork Clarity Call.
We will briefly discuss your goals and recent bloodwork and determine which next step, if any, makes the most sense for you.
Research / External Links
