If you want to lose fat, build muscle, or somehow achieve both at the same time, you’re not alone. Body recomposition has evolved from niche bodybuilding jargon into one of today’s most sought-after fitness goals. But as the trend has grown, so has one persistent claim: the more muscle you build, the more calories you burn, making weight loss significantly easier.
Technically, there’s some truth to that. Muscle tissue is more metabolically active than fat tissue, meaning it requires more energy to maintain. But the difference is often exaggerated, creating the impression that simply adding muscle will dramatically boost your metabolism and melt away fat. In reality, body composition (and weight loss in general) is far more nuanced than that.
While muscle growth can certainly support weight loss, it’s not a magic metabolism hack. The real benefits are a little more complex and, in many ways, more important. Experts clear the air below.
Meet the experts: Stuart Phillips, PhD, is a muscle researcher and professor of kinesiology at McMaster University. Rachelle Reed, PhD, ACSM-EP, is an exercise physiologist and Head of Scientific Research and Science Communication at Therabody. Aja Campbell, CSCS, is a certified strength and conditioning specialist, founder of ATTAGIRL, and lead of the sports medicine department at The Mary Louis Academy.
Is muscle the key to weight loss?
“Muscle burns more calories than fat” is one of those fitness claims that’s technically true, but often oversold. Yes, muscle tissue is more metabolically active than fat, but not nearly to the extent people suggest. Gaining a few pounds of muscle won’t suddenly transform your body into a calorie-burning machine while you sit on the couch. The bigger benefit of muscle has less to do with passive calorie burn and more to do with what your body must do to build, maintain, and use it.
“I avoid saying that muscle is the main driver of weight loss,” says Stuart Phillips, PhD, a professor of kinesiology at McMaster University. Instead, it’s more accurate to say that muscle improves the quality of weight loss by helping preserve lean mass while reducing fat—a process known as body recomposition, he says.
Rachelle Reed, PhD, ACSM-EP, explains that muscle matters less because of how many calories it burns at rest and more because of how it supports overall metabolic health. More muscle can improve insulin sensitivity, increase training capacity, and lead to healthier shifts in body composition over time. “We frequently hear ‘muscle burns more calories than fat’ because it’s technically true, but it’s often oversimplified in a way that can be misleading,” she says.
How many more calories does muscle really burn than fat?
Muscle does burn more calories than fat at rest, but the difference is smaller than most people think. According to Phillips, one pound of muscle burns about five to seven calories per day at rest, while a pound of fat burns around two. “Gaining five pounds of muscle isn’t going to add hundreds of calories to your resting metabolism,” he says. “Realistically, it might add 20 to 30 calories per day, which is certainly useful, but [it’s] not a fat-loss hack.”
Fat loss still comes down to maintaining an energy deficit, meaning consuming fewer calories than your body needs to perform its daily functions. “The bigger metabolic benefit of strength training and building muscle is not that new muscle burns huge amounts of calories at rest,” Phillips says. “It’s that the training itself uses energy, preserves muscle during dieting, improves metabolic health, and supports better long-term weight maintenance.”
In other words, muscle promotes fat loss mostly through the habits that come with building it. People focused on building muscle are usually strength training consistently, eating more protein, paying closer attention to food quality, and prioritizing recovery, Phillips explains. Together, the combination of those behaviors can make fat easier and more sustainable.
Other Ways Muscle Plays a Role in Weight Loss
When it comes to weight loss, people often focus on metabolism and how many calories muscle burns at rest. But muscle plays a much bigger role in overall health and body composition than that alone. Here’s how.
It regulates blood sugar.
One of muscle’s most important roles is helping regulate blood sugar. Muscle tissue is a major storage https://gymforcestore.com/ for glucose—the sugar your body gets from carbohydrates—and after you eat, your muscles pull glucose out of the bloodstream to use for energy or store for later, says Aja Campbell, CSCS, the founder of ATTAGIRL and lead of the sports medicine department at The Mary Louis Academy. People who have more muscle mass and exercise regularly tend to have better blood sugar control because their muscles are more effective at absorbing and using glucose.
On the flip side, low muscle mass combined with inactivity can contribute to insulin resistance, a condition in which the body’s cells stop responding properly to insulin (a hormone produced by the pancreas that plays a crucial role in regulating blood sugar), Campbell says. When the body becomes insulin resistant, glucose has a harder time getting into the muscles, fat, and liver, which can raise blood sugar levels and eventually increase the risk of both type 2 diabetes and weight gain.
It boosts functional strength.
Another driving factor of weight loss is that muscle boosts functional strength — the kind of strength you rely on for everyday activities like carrying groceries, climbing stairs, lifting kids, or getting up off the floor. While “functional” looks different for everyone depending on their lifestyle and age, Campbell says having more lean muscle mass generally allows the body to move more efficiently and better handle physical demands. And when that day-to-day movement feels easier, people are more likely to stay active.
An increase in daily movement can also lead to higher levels of NEAT, or non-exercise activity thermogenesis—the calories burned through everyday movement outside of structured exercise, per Campbell. Walking around the house, cleaning, standing, or taking the stairs all contribute to NEAT, and those small bursts of movement accumulate to increase overall energy expenditure and improve weight management.
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How to Build Muscle While Still Losing Fat
Strength train at least two to three days a week.
Phillips recommends strength training at least two to three times a week. Using dumbbells, resistance bands, or weight machines help build and maintain muscle mass, which supports long-term weight management.
Note, though: to actually build muscle, your workouts need to be challenging enough to push your body to adapt. Per Campbell, this means pushing yourself close to failure on working sets, and hitting around 12 or more sets per muscle group per week.
Sounds like a lot, but your workouts don’t need to be overly complicated to achieve it. “A simple, repeatable structure often works best, so I recommend full-body training three days per week with a mix of upper and lower body movements,” Campbell says. And compound exercises, or movements that target multiple muscle groups at once, can give you a lot of bang for your buck. Exercises like deadlifts, squats, bench press, and pull-ups can build strength and muscle more efficiently while maximizing your workout time.
Progress gradually.
Progressive overload — gradually increasing the weight, sets, or reps to continue challenging your muscles — is one of the main drivers of steady muscle-building progress, says Campbell. Without that gradual increase in difficulty, results can stall because your body adapts to whatever it’s consistently doing.
“Your working sets should feel challenging,” Phillips says. “Continue adding reps, sets, load, or better technique over time, because consistency beats novelty.”
Prioritize recovery.
Getting enough sleep and recovery is essential, because both play a key role in muscle growth, hormone balance, and how your body regulates metabolism. When you don’t get enough sleep, it can become harder to manage hunger because sleep deprivation disrupts hormones like leptin and ghrelin, which regulate appetite. Lack of sleep and recovery between training sessions can also increase the risk of injury and make it tougher to stay consistent with workouts, ultimately slowing progress, Reed says.
Given such, Reed recommends aiming for at least seven to nine hours of sleep each night, along with regularly incorporating active recovery techniques like stretching, mobility work, and foam rolling.
Maintain a moderate calorie deficit while prioritizing protein.
If your goal is weight loss, it may seem like eating as little as possible would speed up results—but an overly aggressive calorie deficit can actually work against you. While a moderate calorie deficit is beneficial for promoting fat loss, undereating or crash dieting makes it difficult to build muscle and may even lead to muscle loss, which is the oppohttps://gymforcestore.com/ of what you want during body recomposition, Campbell says. A registered dietitian or doctor can determine the right approach specific to your goals, but Phillips generally recommends aiming for a moderate deficit of about 300 to 500 calories per day for sustainable progress.
That said, when your goal is to build muscle and shed fat, protein becomes especially important. Research suggests that higher-protein diets may help you lose weight—and even support long-term weight maintenance—since protein increases the number of calories your body burns during digestion. Protein also keeps you fuller for longer, making it easier to stick to your nutrition goals.
Individual protein needs vary, but Phillips says most people, especially those looking to build muscle, need about 1.2 to 1.6 grams of protein per day per kilogram of bodyweight. Ideally, that protein should be spread out throughout the day, with roughly 20 to 30 grams at each meal, plus additional protein-rich snacks when needed.
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Don’t rely on the scale.
During body recomposition, the number on the scale may not move as much as you’d expect, but that doesn’t mean you’re not making progress. “The scale is a crude tool because it can’t tell the difference between fat, muscle, water, glycogen, and gut contents,” Phillips says. For example, if someone starts strength training, their body may naturally store more muscle glycogen and water, while also losing fat and building lean muscle tissue, he explains. In this case, the scale might barely budge, though meaningful changes are happening beneath the surface.
Instead of solely relying on the scale, Campbell recommends paying attention to other signs of progress, like how your clothes fit, increases in strength and energy, or seeing more visible muscle definition. If you want more detailed data, body composition tests such as a DEXA scan can measure changes in lean muscle mass and body fat.
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The Bottom Line: While muscle does burn more calories at rest than fat, the effect is smaller than it’s often made out to be. Sustainable fat loss still depends on maintaining an energy deficit, but the habits that build and preserve muscle—especially resistance training and adequate protein intake—make that process more effective and easier to maintain long term.
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