Losing weight and getting fitter comes down to two things working together: eating fewer calories than your body burns and moving enough to protect your muscle, metabolism, and health. A safe, sustainable target is 1 to 2 pounds of weight loss per week. That pace is slow enough to preserve muscle and fast enough to see real progress within a few months. Here’s how to set up both sides of that equation.
How Your Body Burns Calories
Before changing anything, it helps to understand where your calories actually go each day. Your total daily energy expenditure has three main components. Your basal metabolic rate, the energy your body uses just to keep you alive while at rest, accounts for roughly 60% of the total. The thermic effect of food, the energy it takes to digest and absorb what you eat, adds another 8 to 15%. Everything else falls under activity: both structured exercise and the thousands of small movements you make throughout the day like walking, fidgeting, cooking, and cleaning.
That last category matters more than most people realize. In sedentary people, non-exercise movement accounts for only 6 to 10% of daily calorie burn. In highly active people, it can reach 50% or more. This means that what you do outside the gym, taking stairs, walking while on the phone, standing at your desk, can have a bigger impact on your total calorie burn than a 45-minute workout. Formal exercise still matters enormously for health and body composition, but don’t overlook the power of simply being less sedentary throughout the day.
Setting Up Your Diet
Weight loss requires a calorie deficit, meaning you consume less energy than you burn. The simplest way to estimate your needs is to multiply your body weight by an activity factor (online TDEE calculators do this for you), then subtract 300 to 500 calories from that number. This creates a moderate deficit that’s large enough to produce steady fat loss but small enough to avoid constant hunger and muscle breakdown.
Where those calories come from matters. Protein is the single most important nutrient to prioritize during weight loss. Research shows that consuming at least 1.2 grams of protein per kilogram of body weight per day significantly reduces the amount of muscle you lose while dieting. For a 170-pound person, that works out to about 93 grams of protein daily, roughly equivalent to a chicken breast at lunch, a palm-sized portion of fish at dinner, and a cup of Greek yogurt as a snack. Spreading protein across meals rather than loading it into one sitting helps your body use it more efficiently.
Beyond protein, focus on minimally processed foods. Studies comparing ultra-processed foods to whole foods find that the more processed a food is, the less satisfying it tends to be and the higher the blood sugar spike it produces. In practical terms, this means a bowl of oatmeal with berries keeps you fuller than a granola bar with the same calorie count. You don’t need to eliminate processed food entirely, but building most of your meals around vegetables, fruits, whole grains, lean proteins, and healthy fats makes it much easier to stay in a calorie deficit without feeling deprived.
What Your Exercise Week Should Look Like
The World Health Organization recommends at least 150 minutes of moderate-intensity aerobic activity per week, plus muscle-strengthening activities on two or more days. That 150 minutes can be split however you like: five 30-minute sessions, three 50-minute sessions, or even short 10 to 15-minute walks scattered throughout the day. Brisk walking, cycling, swimming, and dancing all count as moderate intensity. A simple test: if you can talk but not sing during the activity, you’re in the right zone.
Resistance training deserves equal billing with cardio, not an afterthought. A study comparing aerobic training, resistance training, and a combination of both in overweight adults found that only the groups doing resistance training gained lean body mass. The aerobic-only group did not. This matters because muscle tissue burns more calories at rest than fat tissue does, so preserving or building muscle during weight loss creates a modest but real increase in your resting metabolic rate. You don’t need a complicated program. Two to three sessions per week covering major movement patterns (squats, hinges, pushes, pulls, and carries) using dumbbells, machines, resistance bands, or body weight is enough for most people.
Why Weight Loss Stalls and How to Respond
Almost everyone who diets will hit a plateau, typically somewhere between three and six months in. This isn’t a failure of willpower. Your body actively adjusts to prolonged calorie restriction by reducing the energy it burns, a process called metabolic adaptation. Research tracking dieters over two years found that their metabolic rate dropped by 5 to 13% more than the loss of body weight alone would predict. Even more notable: this adaptation persisted even after weight loss stopped and people were eating at maintenance calories again.
The body achieves some of this reduction through subtle behavioral changes you may not notice, like moving less throughout the day, sitting more, and being slightly less energetic during workouts. This is why tracking your step count or general activity level can be just as useful as tracking calories.
Two strategies show promise for managing plateaus. First, intermittent approaches to dieting, such as alternating weeks of calorie restriction with weeks of eating at maintenance, appear to produce greater weight loss with less metabolic slowdown compared to continuous dieting. Second, maintaining or increasing physical activity after weight loss is the most effective buffer against metabolic adaptation and weight regain.
Hydration During Exercise
Dehydration impairs performance faster than most people expect. Losing just 2% of your body weight in fluid (about 3 pounds for a 150-pound person) measurably reduces endurance, strength, and focus. The National Athletic Trainers’ Association recommends drinking about 500 to 600 ml of water (roughly 20 ounces) two to three hours before exercise, then another 200 to 300 ml (8 to 10 ounces) in the 10 to 20 minutes before you start. During exercise, aim for 200 to 300 ml every 10 to 20 minutes, adjusting based on how much you sweat. After your session, replace whatever fluid you lost. Weighing yourself before and after a workout gives you a rough sense of your personal sweat rate.
Habits That Predict Long-Term Success
The National Weight Control Registry has tracked thousands of people who lost at least 30 pounds and kept it off for two or more years. The patterns among successful maintainers are remarkably consistent. Daily physical activity is the single factor cited most often as the key to keeping weight off, with most participants reporting 60 or more minutes per day. That doesn’t mean 60 minutes of hard exercise. It includes walking, active commuting, and general movement.
Other common habits among long-term maintainers include self-monitoring (tracking food, weight, or activity in some form), portion control, choosing lower-fat foods most of the time, and developing problem-solving skills for difficult situations like travel, holidays, and social events. The thread connecting all of these is consistency over perfection. People who maintain weight loss don’t follow rigid rules. They build flexible systems that keep working when life gets complicated.
Getting Started Safely
If you have a known heart condition, high blood pressure, chest pain during activity, a history of dizziness or fainting, diabetes, joint or bone problems, or any chronic medical condition, check with your doctor before starting a new exercise program. The same applies if you’ve been told to do only medically supervised physical activity. For everyone else, the most important guideline from the WHO is simple: any amount of physical activity is better than none. Start where you are, add a little each week, and build from there.