Key points
- When you lose weight, you lose a mix of fat, water and some muscle. The goal is to make most of that loss come from fat.
- A moderate calorie deficit, enough protein and regular strength training are the three main ways to protect muscle.
- Cardio and daily movement add to your energy use and support heart health.
- Measuring more than body weight, such as your waist and strength, gives a clearer picture of progress.
Weight loss vs. fat loss
The scale measures everything: fat, muscle, bone, organs, water and the food in your digestive system. Early weight loss often includes a noticeable amount of water, especially if you reduce carbohydrates. Over time, steady weight loss comes mostly from stored fat, but some muscle can be lost too, particularly with very large calorie deficits and little strength training.
Muscle matters. It helps you stay strong and mobile as you age, supports blood sugar control, and contributes to the energy your body uses. That's why a good fat-loss plan aims to keep as much muscle as possible.
1. Create a moderate calorie deficit
Fat loss still depends on using more energy than you take in. A moderate deficit tends to work better than an aggressive one because it's easier to sustain and is less likely to cost you muscle, energy and mood. A common starting point is eating about 250 to 500 fewer calories than your estimated maintenance needs, which you can estimate with our calorie calculator.
Avoid very low-calorie diets on your own
Very low-calorie diets can cause muscle loss, nutrient shortfalls and other side effects. They should only be used under medical supervision.
2. Eat enough protein
Protein provides the building blocks your muscles need. Research suggests that eating somewhat more protein than the minimum recommended amount can help preserve muscle during weight loss and also helps you feel full. Practical ways to do this:
- Include a palm-sized portion of protein at each meal.
- Spread protein across the day instead of saving it all for dinner.
- Use protein-rich snacks, such as Greek yogurt, cottage cheese, edamame, hard-boiled eggs or a small handful of nuts.
If you have kidney disease or another condition that affects protein needs, ask your doctor how much is right for you.
3. Lift weights or do resistance training
Strength training sends your body a clear signal to keep its muscle. You don't need a gym; bodyweight exercises, resistance bands and dumbbells at home all work.
| Movement | Example exercises | Starting point |
|---|---|---|
| Squat | Chair squats, goblet squats | 2 sets of 8–12 |
| Hinge | Hip bridges, dumbbell Romanian deadlifts | 2 sets of 8–12 |
| Push | Wall or incline push-ups, dumbbell press | 2 sets of 8–12 |
| Pull | Band rows, dumbbell rows | 2 sets of 8–12 |
| Core | Planks, dead bugs | 2 sets of 20–30 seconds |
Aim for at least two sessions per week that work all major muscle groups, as recommended by the Physical Activity Guidelines for Americans. Gradually add weight or repetitions as exercises become easier. If you're new to exercise or have joint, heart or other health concerns, check with your doctor first.
4. Add cardio and daily movement
Aerobic exercise, such as brisk walking, cycling, swimming or dancing, burns energy and strengthens your heart and lungs. Everyday movement outside of workouts, like walking, chores and standing, also adds up and can vary a lot from person to person.
A simple approach is to build a daily walking habit first, then add longer or more vigorous sessions as your fitness improves.
5. Recover well
Muscles adapt and rebuild between workouts. Getting enough sleep, taking rest days and managing stress help your training pay off and make it easier to stick with your eating plan.
How to measure fat-loss progress
- Waist circumference: measure at the top of your hip bones, after breathing out, every two to four weeks.
- Strength: note when you can lift more weight or do more repetitions.
- Photos and clothing fit: these often show changes the scale misses.
- Weekly average weight: more reliable than any single weigh-in.
Home body-fat scales and other consumer devices can be affected by hydration and other factors, so focus on trends rather than exact numbers.
What about belly fat?
Many people want to lose fat from a specific area, especially the stomach. Our guide on how to lose belly fat explains why spot reduction doesn't work and what does help.
Medical note
This guide is general education, not medical advice. If you have a health condition, take medication, are pregnant or breastfeeding, or have a history of disordered eating, talk with your doctor or a registered dietitian before changing how you eat or exercise. See our medical disclaimer.