To lose fat and build muscle at the same time, you need to eat enough protein to fuel muscle growth while keeping your overall calories low enough to burn stored fat. That means a moderate calorie deficit of about 500 to 750 calories below your daily needs, with protein making up a larger share of your plate than you might expect. The specific foods you choose matter because some deliver far more protein per calorie than others, and that ratio is what makes or breaks body recomposition.
How Many Calories to Eat
A daily deficit of 500 to 750 calories lets most people lose roughly two pounds per week while keeping enough energy available for muscle repair. Going much lower than that backfires. Very low calorie diets, those around 1,000 to 1,500 calories per day, tend to strip away muscle mass and water weight rather than actual body fat. You end up lighter on the scale but with a worse body composition than when you started.
The simplest way to find your target is to estimate your maintenance calories (the amount that keeps your weight stable) and subtract 500. If you’re training hard three or four days a week and notice your lifts dropping steadily, you’ve probably cut too deep. A smaller deficit of 300 to 400 calories is a reasonable adjustment that preserves performance while still producing fat loss over time.
How Much Protein You Actually Need
The American College of Sports Medicine recommends 1.2 to 1.7 grams of protein per kilogram of body weight per day for people who exercise regularly. For a 170-pound person (about 77 kg), that works out to roughly 92 to 131 grams of protein daily. If you’re in a calorie deficit and trying to hold onto muscle, aim for the higher end of that range or even slightly above it.
Research from the International Society of Sports Nutrition suggests that intakes above 3.0 grams per kilogram per day may actually promote fat loss in resistance-trained individuals. That’s a lot of protein, and most people don’t need to go that high. But the takeaway is clear: when you’re cutting calories, erring on the side of more protein is consistently better for body composition than eating less of it.
Spreading your protein across three to four meals also matters more than total daily intake alone. Each meal should contain enough protein to trigger the muscle-building response in your cells. For most adults, that threshold sits around 25 to 40 grams per meal. Older adults may need to aim for the higher end of that range, since the trigger point rises with age.
The Best Protein Sources Per Calorie
When you’re eating in a deficit, every calorie counts. Some protein sources give you dramatically more muscle-building fuel per calorie than others. Here’s how common options compare:
- Cod, baked (3 oz): 89 calories, 19.4 g protein
- Chicken breast, skinless (3 oz): 101 calories, 18 g protein
- Pork tenderloin (3 oz): 139 calories, 24 g protein
- Turkey breast, skinless (4 oz): 153 calories, 34 g protein
- Beef round, lean (3 oz): 138 calories, 24.9 g protein
- Shrimp, boiled (1 oz): 28 calories, 5.9 g protein
- Tuna, canned in water (1/4 cup): 45 calories, 9.8 g protein
- Egg whites (1 large): 16 calories, 3.6 g protein
Turkey breast is the standout here, delivering 34 grams of protein for just 153 calories. Skinless chicken breast and white fish like cod are close behind. These lean proteins let you hit high protein targets without burning through your calorie budget. Fattier options like 80% lean ground beef (230 calories for 22 g protein) or salmon (175 calories for 19 g protein) still have a place in your diet, but they take up more of your calorie allowance. Salmon in particular is worth including a couple of times per week for its omega-3 content.
Whole eggs are a good middle ground at 75 calories and 6 grams of protein each. If you need to keep calories tight, mixing one or two whole eggs with extra egg whites gives you the flavor and fat-soluble nutrients from the yolk without doubling your calorie intake.
Carbs and Fats: What Fills the Rest
Once your protein target is set, the remaining calories come from carbohydrates and fats. Neither is the enemy. Carbohydrates fuel your training sessions, which is what actually stimulates muscle growth. Fats support hormone production, including the hormones responsible for building and maintaining muscle tissue.
A practical split for most people in a moderate deficit: protein at 30 to 35 percent of total calories, carbohydrates at 35 to 45 percent, and fats at 20 to 30 percent. If you weigh 170 pounds and eat around 2,000 calories, that could look like 150 grams of protein, 200 grams of carbs, and 55 grams of fat.
Choose carbohydrate sources that also deliver fiber and micronutrients: oats, rice, potatoes, sweet potatoes, beans, lentils, and fruit. These keep you full longer than refined options, which matters a lot when you’re eating fewer calories. For fats, olive oil, avocado, nuts, and fatty fish cover the essentials without requiring much thought.
What to Eat Around Your Workouts
Eat a full meal three to four hours before training, or a carb-focused snack about two hours before. Even a small amount of carbohydrate, around 15 to 25 grams, before a session can help you train longer and harder. That could be a banana, a slice of toast, or a small serving of oatmeal.
Having a small amount of protein before or during a lifting session may also improve muscle building. A protein shake sipped during training works, or simply timing your pre-workout meal to include a solid protein source covers this.
After training, the priority is a meal or snack that combines protein and carbohydrates. The recovery window, roughly the first hour after finishing your workout, is when your muscles are most receptive to absorbing nutrients for repair. This doesn’t need to be complicated. A chicken breast with rice, a protein shake with a banana, or Greek yogurt with fruit all do the job. The key is not waiting several hours after a hard session to eat.
A Day of Eating for Recomposition
Here’s what a practical day might look like for someone eating around 2,000 calories with a protein target of 150 grams:
Breakfast: Two whole eggs scrambled with extra egg whites, a slice of whole grain toast, and a piece of fruit. Roughly 350 calories and 30 g protein.
Lunch: Grilled chicken breast over a large salad with mixed greens, chickpeas, tomatoes, cucumber, and olive oil dressing. Roughly 500 calories and 40 g protein.
Pre-workout snack: Greek yogurt with a handful of berries. Roughly 150 calories and 15 g protein.
Post-workout dinner: Baked cod or turkey breast with roasted sweet potatoes and steamed broccoli. Roughly 550 calories and 40 g protein.
Evening snack: Cottage cheese or a casein protein shake. Roughly 200 calories and 25 g protein.
That totals around 1,750 calories and 150 grams of protein, leaving a small buffer for cooking oils, condiments, or a slightly larger portion at any meal.
Creatine: The One Supplement Worth Considering
Creatine monohydrate is one of the most studied sports supplements in existence, and it consistently works. In combination with resistance training, creatine supplementation over six to eight weeks increased lean body mass by roughly 6 to 7 pounds in research reviewed by the National Strength and Conditioning Association. Those gains come partly from increased water in muscle cells, but studies confirm that actual muscle protein content increases too.
The standard approach is 3 to 5 grams per day, taken at any time. Some protocols recommend a loading phase of 20 grams per day for the first week to saturate your muscles faster, but a consistent daily dose of 3 to 5 grams gets you to the same place within a few weeks. Creatine is inexpensive, safe for long-term use, and one of the few supplements with a genuinely meaningful effect on muscle and strength.
Common Mistakes That Stall Progress
The most frequent error is cutting calories too aggressively while training hard. Your body interprets a severe deficit as a threat and responds by breaking down muscle for energy. A moderate deficit with high protein intake sends the opposite signal: there’s enough fuel for survival, and the protein provides raw material for muscle repair.
The second mistake is not eating enough protein at each sitting. Eating 10 grams of protein six times a day is not the same as eating 30 to 40 grams four times a day. Your muscles need a certain concentration of amino acids at once to switch on the building process. Spreading protein too thin across many tiny meals or skewing it all into one large dinner leaves muscle-building potential on the table.
Finally, many people undereat carbohydrates in a misguided effort to speed up fat loss. Carbs are what allow you to push hard in the gym. Without adequate carbohydrate, your training intensity drops, you recover poorly, and the stimulus that tells your muscles to grow gets weaker. Cutting 500 calories from your day is enough. You don’t also need to eliminate an entire food group.