You need to eat about 500 to 600 fewer calories than your body burns each day to lose roughly one pound per week. That's the short answer. But figuring out what that actually looks like for you? That's where it gets personal.
I've lost weight myself using this exact principle. I'm not a doctor, but I have spent a lot of time reading the research and talking with people who have done it successfully. So let me share what actually works.
What You Need
First, you need to know your maintenance calories. That's the number of calories you burn just living your life. For women, that's typically around 2,000 per day. For men, it's more like 2,500. These numbers change based on your activity, age, and genetics.
Then, subtract 500 to 600 calories from that number. This deficit will put you in the sweet spot for safe, sustainable weight loss. Don't go over 1,000 calories below maintenance. That's the upper safe limit, and even that is aggressive.
Why this range? It's backed by clinical data. Eating too little slows your metabolism and can cause muscle loss. Trust me, I've tried the crash diet thing. It's not worth it.
Step-by-Step Guide
- Find your maintenance calories. Use an online calculator or the Mifflin-St Jeor equation, which estimates your basal metabolic rate based on your weight, height, age, and sex.
- Set your deficit. Aim for 500 to 600 calories below maintenance. This should lead to about one pound of weight loss per week.
- Track everything. I'm not saying you need to weigh every single flake of oatmeal, but for a few weeks, keep a log. A food scale is way better than measuring cups. A single serving of rice can vary by nearly 50% depending on how you scoop it.
- Increase your activity. A 40-minute brisk walk burns about 150 calories for many people. That's like cutting a 12-ounce soda out of your day. One small change, big impact.
- Monitor your results. If you're not losing, check your portions again. It's easy to overlook the extra oil or the 'healthy' granola.
If you want an even more structured approach, check out our guide on a calorie-controlled diet to lose weight. It walks you through meal planning and portion control step by step.
Common Mistakes
Mistake #1: Drastic cuts. A 1,200-calorie diet for a man who needs 2,500? That's a recipe for burnout and bingeing. Your body will fight back.
Mistake #2: Ignoring liquids. A 16-ounce latte can have 250 calories. That's the same as an extra meal for some people.
Mistake #3: Not adjusting. As you lose weight, your maintenance calories drop. You'll need to recalculate your deficit. It's not a set-it-and-forget-it deal.
Troubleshooting
If you're doing everything right and still stuck, let's talk about solutions.
First, make sure you're eating enough protein. It keeps you full and helps preserve muscle. A higher protein intake can make a big difference when you're in a deficit.
Second, look at your sleep and stress. High cortisol levels can hold onto weight, especially around the belly. Diet and exercise are your foundation, but they're not the whole story.
If you have medical conditions like insulin resistance or metabolic issues, your body may respond differently to a standard deficit. You might find our guides on calorie deficit for weight loss or intermittent fasting for weight loss helpful for tailoring your approach.
Some people also turn to supplements like green tea extract or caffeine to boost metabolism, but I always suggest talking to your doctor first. Supplements can interfere with medications or have side effects. If your progress has stalled, a healthcare provider can help you figure out why.
FAQ
How many calories should I eat per day to lose weight?
Start with your maintenance calories, roughly 2,000 for women, 2,500 for men, and subtract 500 to 600. That lands you around 1,400 to 1,500 for women, and 1,900 to 2,000 for men. Adjust based on your own results.
Is it safe to eat less than 1,200 calories?
Not without medical supervision. Very low calorie diets can cause nutrient deficiencies, gallstones, and heart problems. Stick to a moderate deficit for long-term results.
Will I lose weight faster if I eat fewer calories?
No. In fact, going too low often backfires. You lose muscle, your metabolism slows, and you regain the weight as soon as you eat normally. Slow and steady wins this race.
Do I need to exercise?
Not strictly, but it helps a lot. Exercise burns extra calories and protects your muscle mass. A combination of diet and activity has the best evidence for long-term success.
About the author: This article was written by a health and fitness researcher with personal experience in sustainable weight loss. For more on our editorial standards, see our About page.
If you need more structure, check out our full guide on how to lose weight for a complete system.
