How to Lose Weight: A Calorie-Deficit Guide That Sticks

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How weight loss actually works

You lose weight when you eat fewer calories than your body burns. Your body covers the shortfall by pulling from stored fat, and the scale goes down. That gap between what you eat and what you burn is the calorie deficit, and it's the only mechanism behind every diet that has ever worked. Keto, fasting, low-carb, Weight Watchers — they all work by putting you in a deficit, just by different routes.

So the first number you need isn't a meal plan. It's the calories you burn in a day, your Total Daily Energy Expenditure (TDEE). Once you know that, your target is simple: eat under it. The FindTDEE calculator gives you the number in about a minute, and the cutting calorie calculator applies the deficit for you.

Step 1: Set your calorie deficit

Subtract 250 to 500 calories from your TDEE. That's the target. A 500-calorie daily deficit works out to roughly one pound of fat a week, since a pound of body fat stores about 3,500 calories. If your TDEE is 2,400, you'd eat somewhere between 1,900 and 2,150 a day.

Pick the gentler end if you'd rather keep the diet easy and protect muscle. A smaller deficit you can hold for months beats an aggressive one you quit in three weeks. The table shows the common deficit sizes and the pace each one targets.

Two guardrails. First, 1 to 2 pounds a week is the safe ceiling that major health bodies agree on; faster than that and you start losing muscle and water rather than fat. Second, don't eat below roughly 1,200 calories (women) or 1,500 (men) without medical guidance — below that it's hard to hit your nutrient needs.

Want the math done for you? The cutting calorie calculator gives you a fat-loss target with the deficit built in, and the macro calculator splits it into protein, carbs, and fat.

Step 2: Eat enough protein

Protein is the one macro to get right in a deficit. Aim for about 0.7 to 1 gram per pound of body weight per day. It does two jobs that make or break a cut:

1. It keeps you full on fewer calories

   Protein is the most filling macronutrient — it blunts hunger hormones like ghrelin and keeps you satisfied between meals. When you're eating less overall, that's the difference between a diet you can stick to and one that has you raiding the cupboard at 10pm.

2. It protects your muscle

   In a deficit your body can break down muscle for energy. Enough protein, paired with lifting, tells it to burn fat instead. In controlled studies, dieters eating roughly double the protein held on to far more muscle than low-protein dieters losing the same weight. Less muscle lost means a better-looking result and a metabolism that doesn't tank.

A practical rule: put a palm-sized portion of protein (chicken, fish, eggs, Greek yogurt, lean beef, tofu, beans) at every meal. Carbs and fats fill the rest of your calories — neither is the enemy, and both have a place. You don't need to cut food groups or eat "clean" 100% of the time. You need to hit your protein and stay under your calorie target.

Step 3: Move more (NEAT and steps)

Daily movement burns more fat-loss calories than your workouts do — and most people overlook it. The calories you burn walking, fidgeting, standing, and pottering around are called NEAT (non-exercise activity thermogenesis), and they swing your daily burn more than a single gym session ever could. Someone on their feet all day can burn hundreds of calories more than a desk worker without "exercising" at all.

The simplest lever is steps. A target of 8,000 to 10,000 steps a day adds a meaningful chunk of burn and is easy to track on any phone. Take stairs, park further away, walk after meals, pace on calls. It costs you nothing in willpower at the dinner table, which is exactly why it helps.

Step 4: Lift to keep your muscle

Resistance training is what turns "weight loss" into "fat loss." Lifting weights two to four times a week signals your body to hold on to muscle while you're in a deficit. Without that signal, a chunk of what you lose can be muscle — and that's the weight you least want gone, because muscle is what gives a lean look and keeps your metabolism up.

You don't need a complicated program. The best routine is one you'll actually do. A workable starting point:

• Hit each muscle group at least twice a week. Cover the big movements: something for legs, push (chest, shoulders), and pull (back).
• Pick 4–6 exercises you enjoy and rotate in new ones when you get bored. Free tools like MuscleWiki show you exercises for any muscle group with form demos.
• Progress gradually. Add a little weight or a rep or two over time, and write down what you did so you can see it climb.
• Don't train through pain. Rest days are part of the plan; recovery is when you actually get stronger.

For a full beginner program built around these principles, see how to build muscle and the at-home options in best home workouts. Cardio is useful for your heart and adds to your burn, but lifting is what protects the muscle.

Step 5: Track honestly

The number-one reason people stall in a deficit is that they're eating more than they think. Research consistently finds people underreport their intake by 20 to 30 percent — sometimes more. It's rarely deliberate. It's the splash of oil, the handful of nuts, the bites off a kid's plate, the weekend that didn't get logged.

For the first few weeks, weigh your food on a kitchen scale and log everything in an app. You don't have to do it forever — a few weeks teaches you what proper portions actually look like, and the accuracy is what makes the difference. A scale that links to a tracking app makes logging fast.

• Weigh, don't eyeball. "One tablespoon" of peanut butter is usually two or three. Cooking oils and condiments are the quiet calorie bombs.
• Log the weekends. Many people diet perfectly Monday to Friday and erase the whole deficit on Saturday.
• Weigh yourself weekly, same time, same conditions. Day-to-day weight bounces with water, salt, and digestion. Watch the multi-week trend, not the daily number.
• Track more than the scale. Progress photos, how clothes fit, waist measurements, and gym strength all show fat loss even on weeks the scale sticks.

For app and gear recommendations, see the best calorie tracking apps. A simple digital food scale makes logging accurate, and a smart body scale can show body-composition trends so you don't panic on a flat scale week.

Why crash diets and fast fixes fail

Crash diets fail because they target the wrong thing. Eating 1,200 calories "because faster is better" loses weight quickly, but a big share of that is water and muscle, not just fat. You feel awful, your training suffers, and the diet is impossible to hold — so you quit, eat normally again, and the weight piles back on, often with interest.

There's a physiological piece too: long, aggressive deficits nudge your daily burn down as your body adapts to less food, and they crank up hunger. That combination is what drives the rebound. The effect is real, but it's smaller and more reversible than crash-diet horror stories suggest — and a moderate deficit largely sidesteps it.

Ignore the gimmicks that promise speed: detox teas, "fat-burning" foods, waist trainers, metabolism-boosting pills. None of them create a deficit, which is the only thing that loses fat. The unglamorous version — a deficit you can sustain, enough protein, steps, and lifting — is the one that keeps the weight off.

Can you target belly fat?

No — you can't spot-reduce belly fat, or fat anywhere else. There's no exercise, food, or supplement that burns fat from one specific area. Crunches build the muscle under your belly fat; they don't remove the fat on top of it.

What works is losing total body fat through a sustained calorie deficit. As your overall body fat drops, your waist comes down with it. Where you lose it first — and last — is decided by genetics, not by which body part you train. For most people the midsection is a stubborn area, so it often shows progress later than, say, your face or limbs. That's normal. Keep the deficit going and it does come off.

Breaking a weight-loss plateau

A plateau means your deficit has closed — you're now eating at maintenance without realizing it. Two things cause this. As you lose weight, a lighter body burns fewer calories, so the deficit you set at the start shrinks on its own. And tracking tends to drift looser over time. Here's how to break through, in order:

1. Tighten your tracking for two weeks

   Before you change anything, weigh and log everything again. Most "plateaus" are portions creeping up. Confirm you're truly eating your target first.

2. Recalculate your TDEE

   Re-run your numbers at your current weight. A new, lower TDEE means a new, lower target to restore the same deficit. Do this after every 10–15 pounds lost, not just when you stall. The TDEE calculator and cutting calculator make it quick.

3. Add movement before cutting more food

   Bumping your daily steps up by 1,000–2,000 reopens the deficit without making meals smaller. That's usually more sustainable than dropping calories again.

4. Take a short diet break

   If you've been dieting hard for months, a week or two eating at maintenance can ease hunger, restore energy, and make the next stretch of deficit easier to hold. It slows the timeline slightly but often improves the long-term result.

One thing a plateau is not: a sign your metabolism is "broken." It's just your deficit catching up with your new, smaller body. Reset the number and keep going.