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Weight loss happens when your body burns more calories than you consume. A calorie is a unit of energy in food. Your body uses calories for basic functions like breathing, thinking, and moving. When you eat fewer calories than your body needs, it taps into stored fat for energy, which leads to weight loss over time.
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The average adult woman needs about 2,000 calories per day, while the average adult man needs about 2,500 calories per day. These numbers vary based on age, height, current weight, and activity level. According to the Centers for Disease Control and Prevention (CDC), gradual weight loss of one to two pounds per week is considered safe and sustainable for most people.
Your metabolism—the rate at which your body burns calories—plays an important role in weight loss. Some people naturally have faster metabolisms than others. Factors that affect metabolism include age, muscle mass, genetics, and hormones. As people get older, their metabolism typically slows down, which is why weight management may become more challenging with age.
Understanding these basics helps you set realistic expectations. If you want to lose one pound per week, you generally need to create a deficit of about 3,500 calories over that week, or roughly 500 calories per day. This can come from eating less, moving more, or a combination of both.
Practical takeaway: Track your current eating patterns for a few days to understand how many calories you typically consume. This awareness is the foundation for making changes that work for your body.
Many different eating plans can support weight loss. The most important thing is finding an approach you can stick with long-term, since temporary changes typically lead to temporary results. Different diets work for different people based on their preferences, lifestyle, and health needs.
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The Mediterranean diet emphasizes vegetables, fruits, whole grains, fish, and olive oil while limiting red meat and processed foods. Research published in the New England Journal of Medicine shows that people following Mediterranean-style eating patterns tend to maintain weight loss over time. This approach focuses on food quality rather than strict calorie counting.
Low-carbohydrate diets restrict bread, pasta, rice, and sugary foods while allowing meat, eggs, cheese, and vegetables. Some people find these diets help them feel fuller longer, which reduces overall calorie intake. However, they're not necessarily better than other approaches—studies show they work when people stick to them, just like other diet types.
Plant-based and vegetarian diets eliminate or reduce meat consumption. A study in the Journal of the Academy of Nutrition and Dietetics found that vegetarians typically weigh less than meat-eaters. These diets can support weight loss if they focus on whole foods rather than processed vegetarian products.
Intermittent fasting involves eating within specific time windows or reducing calories on certain days. Some people find this approach simpler than daily calorie counting. Research in Nutrients journal suggests intermittent fasting can be as effective as traditional calorie restriction for weight loss.
Portion control remains important across all approaches. Using smaller plates, measuring food servings, and eating slowly can help people consume fewer calories without eliminating foods they enjoy.
Practical takeaway: Test different eating approaches for two to three weeks at a time to see which one feels manageable and sustainable for your daily life. The "best" diet is the one you'll actually follow.
Exercise supports weight loss and offers numerous other health benefits. The CDC recommends that adults do at least 150 minutes of moderate-intensity aerobic activity each week, such as brisk walking or cycling. This amount of activity, combined with strength training twice weekly, supports overall health and can help with weight management.
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Aerobic exercise burns calories during the activity itself. Walking at 3.5 miles per hour burns approximately 280 calories per hour for a 155-pound person. Running at 6 miles per hour burns roughly 590 calories per hour for the same person. Different activities burn different amounts of calories based on intensity and your body weight.
Strength training builds muscle, which is important for weight loss because muscle tissue burns more calories at rest than fat tissue does. Lifting weights, using resistance bands, or doing bodyweight exercises like push-ups and squats all count as strength training. The American College of Sports Medicine recommends working all major muscle groups at least twice per week.
Non-exercise physical activity also matters. This includes everyday movement like taking stairs, parking farther away, doing household chores, and fidgeting. Studies show that people who move throughout the day often have better weight management results than those who exercise but remain sedentary the rest of the time.
Starting slowly matters, especially if you've been inactive. Begin with activities you enjoy—whether that's walking, dancing, swimming, or sports. You're more likely to stick with exercise you find pleasant. Even 10-minute sessions of activity provide health benefits when done regularly throughout the day.
It's important to note that weight loss from exercise alone is typically slower than weight loss from dietary changes. However, combining moderate exercise with healthier eating creates better results than either approach alone.
Practical takeaway: Choose one or two activities you actually enjoy and can do consistently. Start with a realistic schedule—even 30 minutes of walking three times weekly is a solid beginning that you can build upon.
Many people find that working with healthcare professionals provides valuable support for weight loss. Your primary care doctor can assess your overall health, review medications that might affect weight, and discuss weight loss strategies appropriate for your individual situation.
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Registered Dietitian Nutritionists (RDNs) have specialized training in nutrition science and can create personalized meal plans based on your preferences, health conditions, and lifestyle. You can find registered dietitians through the Academy of Nutrition and Dietetics website. Some insurance plans cover dietitian visits when referred by a doctor.
Behavioral health professionals, including psychologists and counselors, can help address eating patterns related to stress, emotions, or habits. Behavioral approaches like cognitive behavioral therapy have strong research support for supporting long-term weight management. These professionals can teach strategies for managing triggers that lead to overeating.
Weight loss medications are available by prescription for people meeting certain criteria. Medications like phentermine work as appetite suppressants, while newer medications like GLP-1 receptor agonists (semaglutide, tirzepatide) affect hormones that regulate hunger and blood sugar. These medications are meant to work alongside lifestyle changes, not replace them. Your doctor can discuss whether medication might be appropriate for your situation.
Weight loss surgery, or bariatric surgery, is an option for some people with significant weight to lose or weight-related health conditions. Common procedures include gastric bypass, gastric sleeve, and adjustable gastric banding. Surgery requires medical evaluation and ongoing follow-up care. It works by reducing stomach capacity or changing how the digestive system works.
Support groups—whether in-person or online—connect you with others pursuing weight loss. Many people find that sharing experiences and strategies with others helps them stay motivated and learn from different perspectives.
Practical takeaway: Talk with your doctor about your weight loss goals and ask for referrals to registered dietitians or behavioral health specialists who might support your efforts.
Tracking your progress helps you understand what's working and keeps you motivated. The most common method is weighing yourself regularly—weekly or monthly checks show trends over time. However, weight fluctuates daily based on water retention, digestion, and hormones, so focusing on weekly or monthly averages is more useful than daily numbers.
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Beyond the scale, many other measurements reflect progress. Taking body measurements, photos, or noting how clothes fit can show changes the scale might not capture immediately. Some people lose inches before they lose pounds, particularly when combining diet with strength training because muscle weighs more than fat.
Performance metrics offer another way to track progress. Being able to walk farther, exercise longer, or lift heavier weights demonstrates real improvements in fitness and health, regardless of scale weight. These changes often happen before significant weight loss occurs.
Keeping a food journal helps identify eating patterns. Writing down what you eat, how much, and when you eat it—without judgment—reveals patterns you might not otherwise notice. Many people discover
This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.