How Many Calories Should You Eat to Lose Weight?

Losing weight comes down to one core principle: consuming fewer calories than your body burns. This is called a calorie deficit. But figuring out your personal number - and actually staying within it day to day - is where most people get stuck.

Start with your maintenance calories

Your maintenance level is the number of calories that keeps your weight steady. It depends on your age, height, weight, sex, and activity level. Most adults land somewhere between 1,800 and 2,600 calories per day.

To lose weight sustainably, aim for a deficit of 300 to 500 calories below maintenance. That typically produces a loss of about half a pound to one pound per week - slow enough to protect muscle and keep the results lasting.

Why bigger deficits usually backfire

It is tempting to slash calories dramatically, but aggressive deficits lead to muscle loss, low energy, and intense hunger that makes bingeing likely. A moderate deficit you can maintain for months beats a crash diet you abandon in two weeks.

The real challenge: accurate tracking

Studies consistently show that people underestimate how much they eat by 20 to 40 percent. A deficit only works if your logging is accurate - and manual entry is where errors creep in.

• Portion sizes are hard to eyeball, especially oils and sauces.
• Skipping "small" snacks adds up over a week.
• Manual search is tedious, so people quit within days.

This is exactly why photo-based tracking works so well. When logging a meal takes two seconds - snap, confirm, done - you actually do it every time, and your deficit reflects reality.

Putting it together

Estimate your maintenance calories, subtract 300 to 500, and track every meal consistently. Give it three to four weeks, then adjust based on the scale. Consistency, not perfection, is what moves the needle.

A simple experiment for the next two weeks

Choose one daily calorie target, log meals as close to real time as possible, and weigh under similar conditions a few times per week. At the end of two weeks, review the trend and your hunger and energy before changing the target. This gives you better information than reacting to a single high or low day.