Most people who want to lose weight actually want something more specific: they want to lose fat while keeping the muscle they have built. Those are related goals, but they require a more deliberate approach than simply eating less. Cut calories too aggressively without the right nutritional framework in place, and your body will shed muscle along with fat. Here’s how to avoid that.

The starting point is protein. When you’re in a caloric deficit, your body looks for energy from multiple sources, and muscle tissue is one of them. Keeping protein intake high signals to your body that muscle needs to be preserved. Most research points to a target somewhere between 0.7 and 1 gram of protein per pound of bodyweight per day during a fat loss phase. That’s meaningfully higher than what most people eat by default, and hitting it consistently is the single most important dietary lever you can pull.

The size of your caloric deficit matters more than most people realize. A large deficit produces faster weight loss on the scale, but a significant portion of that loss tends to come from muscle rather than fat. A more moderate deficit of 300 to 500 calories below your maintenance level daily allows fat loss to proceed while giving your body enough fuel to preserve lean tissue. It might be slower on paper, but it’s better in practice.

Carbohydrates often become the first thing to go when someone starts dieting, but eliminating them entirely can work against muscle retention. Carbohydrates are the primary fuel source for strength training and hard workouts. Going into those sessions depleted means lower output, and lower output over time means less stimulus for your muscles to stay. Keeping carbohydrates around your training, particularly before and after workouts, helps maintain performance while you’re in a caloric deficit.

Resistance training is the other half of this equation, but from a nutritional standpoint, the point is simple: lifting while dieting sends a clear signal to your body that muscle is being used and needs to be maintained. Nutrition alone will not preserve muscle without that stimulus.

The combination of adequate protein, a moderate deficit, and strategic carbohydrate timing gives your body the best possible conditions to drop fat without sacrificing the muscle underneath it.