Lowering your body fat percentage comes down to losing fat while keeping as much muscle as possible. That distinction matters: crash dieting drops the number on a scale but often sacrifices muscle, which can leave your body fat percentage unchanged or even higher. A sustainable approach combines a moderate calorie deficit, strength training, adequate protein, and enough sleep to keep your hormones cooperating.
Know Your Starting Point
Essential body fat, the minimum your body needs to function, is roughly 3% for men and 12% for women. The “athletic” range sits at 5 to 10% for men and 8 to 15% for women, though those numbers apply mainly to sports where leanness provides a performance edge. Most people aiming to look and feel leaner are targeting something above those athletic ranges, and knowing where you currently stand helps you set a realistic goal.
DEXA scans are the most reliable consumer-accessible method for measuring body fat. Bioelectrical impedance devices (the technology in smart scales and handheld analyzers) can track changes over time at a group level, but they show considerably more variability from reading to reading than DEXA. A study comparing the InBody 770 to DEXA found both detected similar overall changes in body fat percentage after a diet, yet individual readings on the bioimpedance device fluctuated more widely. The practical takeaway: if you use a smart scale, look at the trend over weeks rather than trusting any single number. Weigh yourself at the same time of day, under the same conditions, to reduce noise.
Create a Moderate Calorie Deficit
Your body stores energy in fat cells as triglycerides. When you eat less than you burn, hormones like adrenaline signal those fat cells to release their stored fatty acids into the bloodstream, where your muscles and organs can use them for fuel. This process ramps up during fasting periods and exercise, when insulin drops and adrenaline rises.
The CDC recommends losing about 1 to 2 pounds per week for sustainable results. Faster weight loss increases the chance you’ll lose muscle along with fat, and it becomes harder to maintain. A deficit of roughly 500 calories per day below your maintenance level produces about a pound of loss per week. You can create that gap through eating less, moving more, or a combination of both.
Extreme deficits backfire. When you cut calories too aggressively, your body loses not just fat but also organ tissue and muscle. Because organs have a metabolic rate up to 20 times higher than muscle tissue per unit of mass, even small reductions in organ size can meaningfully lower how many calories you burn at rest. This is what researchers call metabolic adaptation, and it’s one reason aggressive diets lead to plateaus. Interestingly, how much adaptation actually occurs is debated: some studies find a large effect, while others conclude the appearance of adaptation is partly an artifact of how body composition gets measured. Either way, a moderate deficit sidesteps the worst of it.
Prioritize Strength Training
If your only goal were losing total body weight, cardio would be the more efficient tool. A meta-analysis of randomized controlled trials found that aerobic training reduced body mass significantly more than resistance training. But body fat percentage is a ratio, and the denominator matters. That same analysis found resistance training was significantly better at increasing lean body mass. In other words, lifting weights protects and builds the muscle that keeps your body fat percentage moving in the right direction.
The ideal approach combines both. Cardio burns calories during the session and improves cardiovascular fitness. Resistance training preserves muscle, raises your resting metabolic rate slightly, and reshapes your body composition even when the scale doesn’t move much. Aim for at least two to three strength sessions per week that hit all major muscle groups, and layer in cardio on top of that rather than treating it as your primary fat loss tool.
One thing that doesn’t work: spot reduction. Targeted exercises like crunches tighten the muscles underneath but don’t preferentially burn the fat sitting on top of them. The encouraging flip side is that visceral fat, the deeper fat around your organs, actually responds more readily to both diet and exercise than the subcutaneous fat on your hips and thighs because it’s more easily broken down into fatty acids.
Eat Enough Protein
Protein is the single most important macronutrient for changing your body composition. During a calorie deficit, your body looks for energy wherever it can find it, and muscle is a potential source. Higher protein intake signals your body to preserve that muscle.
Research shows that eating at least 1.3 grams of protein per kilogram of body weight per day is the threshold for actually increasing muscle mass, while dropping below 1.0 g/kg/day raises the risk of losing it. For most people trying to get leaner, a range of 1.2 to 1.6 g/kg per day is well supported. For a 170-pound (77 kg) person, that works out to roughly 90 to 120 grams of protein daily.
Spreading your protein across meals throughout the day is more effective for muscle preservation than loading it all into one sitting. Lean meats, fish, eggs, dairy, legumes, and protein supplements all count. The source matters less than hitting your daily total consistently.
Protect Your Sleep
Sleep is an underrated lever for fat loss. A short-term study of 10 men found that just two days of restricted sleep led to an 18% drop in leptin (the hormone that signals fullness) and a 28% spike in ghrelin (the hormone that drives hunger). The participants reported increased cravings, particularly for calorie-dense, high-carbohydrate foods.
This hormonal shift makes maintaining a calorie deficit dramatically harder. You’re hungrier, less satisfied by meals, and drawn to the kinds of foods that are easiest to overeat. Seven to nine hours of sleep per night gives your appetite-regulating hormones the best chance of staying in balance. If you’re doing everything else right and still struggling with cravings or stalled progress, poor sleep is often the missing piece.
Set a Realistic Timeline
At a pace of 1 to 2 pounds lost per week, with strength training preserving your muscle, you might realistically drop 1 to 2 percentage points of body fat per month. Someone starting at 25% body fat who wants to reach 18% could expect the process to take roughly four to six months. Leaner starting points mean slower progress, because your body holds on to its remaining fat stores more tightly.
Patience pays off in a specific way here: the slower you go, the more of your loss comes from fat rather than muscle. That means each pound lost has a bigger impact on your body fat percentage than it would during a crash diet, where you might lose a pound of muscle for every two pounds of fat.
Periodic diet breaks, where you eat at maintenance for one to two weeks, can help offset any metabolic slowdown and give you a psychological reset. These aren’t setbacks. They’re strategic pauses that make the next phase of your deficit more productive.
Putting It All Together
The process is straightforward, even if it isn’t easy. Maintain a moderate calorie deficit of around 500 calories per day. Strength train at least two to three times per week. Eat 1.2 to 1.6 grams of protein per kilogram of body weight daily. Get seven to nine hours of sleep. Add cardio for extra calorie burn and health benefits, but don’t rely on it as your primary strategy. Track your progress with consistent measurements over weeks, not daily fluctuations.
The people who successfully lower their body fat percentage and keep it there treat it as a collection of habits rather than a temporary sprint. Each element, the deficit, the training, the protein, the sleep, reinforces the others. Skip one and the rest become harder to sustain.