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May 31, 2026
Energy
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Fat metabolism (also known as lipid metabolism) is an essential process our bodies perform every day. But how exactly does it work? Understanding the process of fat metabolism can help you make more informed choices about nutrition, movement, and supplementation. Let’s answer some of your “burning” questions!
You’ve probably heard of at least two types of metabolism, fat metabolism and energy metabolism. While energy metabolism is how our bodies turn food into usable cellular energy, understanding fat metabolism may require an explanation.
In simple terms, fat metabolism is a series of normal physiological processes the body uses to break down, transport, and use dietary and stored body fat.[1] Fat is one of the body’s primary sources of energy; it’s also how the body stores excess energy in the form of triglycerides. What we know as “body fat” is stored energy that the body draws on during rest and low- to moderate-intensity physical activity.[2]
Let’s dig into it step-by-step. The first step in fat metabolism occurs during digestion. The body breaks down dietary fat (fat found in our food) into what are known as “fatty acids.” Next, these fatty acids are transported throughout our body via the bloodstream, where they are either directly oxidized to provide energy or stored for later use.[1]
This process, fat metabolism, is just one component of our metabolism, which also includes carbohydrate and protein metabolism.
The term “burning fat” is a common phrase, but understanding the process of fat metabolism can help you put it into context. As stated above, some dietary fat is stored in the body as triglycerides, which help keep energy available when we need it.[1]
The body pulls on these stores of fat, breaking down the stored triglycerides into fatty acids and glycerol. These fatty acids are transported through the bloodstream to the cells that need them, where they're used as fuel inside the cell to provide energy.[1]
While you may think the body pulls on our fat stores only during physical activity, it’s actually doing so constantly, even at rest. However, the rate and proportion of energy the body pulls from stored fat change based on factors such as activity level, exertion intensity, and metabolic state.[2]
Unlike cars, which prefer either regular or diesel, the body uses both fats and carbs for fuel. But how does the body pick which to use, and when? That depends on a few key factors.
The first factor is the intensity of your activity. We’re not going 100% all the time; much of our day is spent with low-intensity activities, like resting, walking, or light exercise. During these times, the body tends to rely more heavily on fat as a fuel source. On the flip side, when you are engaging in more intense activity, such as strenuous exercise, running, or other sports, your body prefers to use glycogen as a fuel source, which is produced from carbohydrates.[3]
Why might that be? Think about it this way: fat is a reliable fuel source, but it takes a bit more time to process. When you’re doing less intense activities, that doesn’t matter, as you have all the time you need to oxidize fat so it can be used for energy. But when you’re expending more energy more quickly, during high-intensity activities, the body wants a source that can be turned into energy in a snap: that’s where carbs fit in.[3]
Another key factor in whether the body prefers fat or carbs is the recency of a meal. Immediately following a meal, the body prefers to use carbohydrates for energy.[4] This makes sense, as fat can be stored for longer, so your body is using the more immediate energy source while you can. During longer periods between meals or during a fast, the body draws more energy from stored fat.
When you start a more strenuous physical activity, the body uses carbohydrates for quick energy, as stated above. However, if that moderate activity is prolonged, the body starts to draw on fat stores as the immediate carbohydrate stores are depleted. Think of it this way: the body pulls from carbohydrates for a sprint, and fat for a marathon.[5]
The rate at which our body uses calories every day is known as our “metabolic rate.” Metabolic rate, influenced by certain factors, directly determines how much fat the body draws on for fuel. Put simply, if our metabolic rate is higher and our body needs more energy, it uses more fuel, which may include drawing on stored fat.
The metabolic rate isn’t just defined by one thing; in reality, it is a combination of several factors. Each of these factors plays a role in energy expenditure, and how much carbohydrates and fats our body uses for fuel every day.
One of the first, and most controllable factors in determining our metabolic rate is the level of physical activity. The higher your rate of physical movement, the more energy your body needs, and the more chances it has to draw on fat as a fuel source. Physical activity level can include things like a bike ride, a nice long walk, or going to the gym, and it’s one of the metabolic factors we have most direct control over.[6]
Muscle mass also influences metabolic rate. Lean muscle tissue is more metabolically active (meaning it requires more energy), so having more muscle tissue raises your resting metabolic rate. This is also known as the basal metabolic rate, or the amount of energy your body expends when you’re not exerting yourself. You can increase muscle mass by practicing regular strength and resistance training.[6]
Age also plays a role in the speed of your metabolism, mostly through its effects on the factors above. With age, many people tend to reduce their physical activity and lose muscle mass, both of which lower the metabolic rate. By maintaining consistency in physical activity and strength training, you can help maintain muscle mass and support your metabolic rate.[6]
Weight loss is a popular subject, and with anything that people talk about a lot, myths are bound to pop up. These misconceptions can mislead you about how your body and metabolism work, leaving you frustrated when you don’t see the results you expect. Let’s break down some of the more common myths about fat burning to help you approach the subject with a more complete understanding.
Reality: There’s no such thing as a “fat-burning mode,” as the body is always using a mix of fuel sources. When you sustain physical activity, the ratio of fat to carbohydrate used for energy gradually increases, but it is not a binary state in which the body switches from using carbs to using stored fats.[5]
Reality: Calories from any macronutrient can be stored as fat, not just in dietary fats. Fat is used by the body as a way to store excess calories for later use, and dietary fat, particularly unsaturated fats, are part of any balanced diet.[7]
Reality: Sweat has no direct link to burning fat; it’s a mechanism the body uses to cool down. While sweating can occur during sustained physical activity, it can also occur on an especially hot day and does not indicate anything about the rate of fat metabolism.[8]
What supplements can do is support your body’s metabolism by providing essential macronutrients and complementing a healthy lifestyle, including regular exercise and a balanced diet. Look to supplements to support a healthy lifestyle, not as a replacement for one.†
You can support healthy fat metabolism by paying attention to three key lifestyle fundamentals: nutrition, movement and sleep.
The best way to support your metabolism through nutrition is by aiming for a balanced diet that includes adequate protein, healthy fats and complex carbohydrates. A balanced diet includes each of these groups, as they are the substrates the body needs for proper fat metabolism.
It’s common for people looking to affect their metabolism to put themselves on a calorie-restrictive diet, but this can be counterproductive. Reducing your calorie intake drastically can slow metabolic processes, as your body may hold onto fat for longer, thinking it may need it later.[6]
Green tea may be a good addition to your daily routine, as its plant compound EGCG has been studied for its support of burning fat for energy.†
You can also support healthy fat metabolism through regular physical activity, especially if it is moderate-intensity and sustained rather than short bursts. Sustained activity helps the body dip into fat as a fuel source, while quick bursts favor carbohydrates for immediate energy.[6] Strength training can help you build or maintain lean muscle mass, which has a higher metabolic rate, supporting a healthy resting metabolic rate over time.
It’s not uncommon for those looking to support their metabolism through exercise to forget that sleep and rest are just as important as activity. Providing your body with adequate sleep supports normal hormonal regulation around metabolism and appetite. Sleep is an important part of any wellness routine, and sleep deprivation has been associated with disruptions in how the body manages energy and fat storage. Practice good sleep hygiene, and aim for consistent, high-quality sleep to support your metabolic health.[9]
If you have persistent concerns about your metabolism or weight, discuss them with a trusted healthcare professional. They are equipped with personalized information to help you take the right steps forward.
Supporting your metabolism starts with healthy lifestyle habits, particularly through balanced nutrition, regular movement and exercise, and good sleep hygiene. For adults looking to complement a healthy lifestyle with a metabolic support supplement, Nature Made offers Metabolyze Capsules, with clinically studied ingredients to support a healthy metabolism and weight management.†
Nature Made Metabolyze Capsules include Greenselect® green tea phytosome to support fat metabolism. This ingredient is a clinically studied, decaffeinated green tea extract formulated with phytosome technology for improved absorption, delivering EGCG plant compounds that help the body burn fat for energy.†
Metabolyze also includes Chromax®, a clinically studied chromium picolinate that helps support healthy weight management, and Vitamin B12 to support daily energy metabolism.♢†
Nature Made Metabolyze is a great choice for those looking to support a healthy lifestyle, including a balanced diet and exercise with a supportive metabolism supplement.†
Explore Nature Made’s Energy Supplements today! Nature Made is the #1 Pharmacist Recommended Vitamins & Supplements Brand.*
Chromax® is a registered trademark of Nutrition 21, LLC.
Chromax® is patent protected.
Greenselect® and Indena Phytosome® are registered trademarks of Indena S.p.A., Italy.
♢Helps convert food into cellular energy†
*Based on a survey of pharmacists who recommend branded vitamins and supplements.
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† These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.
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