What Calorie Deficit Do You Need to Lose 2 Pounds a Week?

The most widely cited rule of thumb is that a 500-calorie daily deficit leads to roughly 1 lb (0.45 kg) of weight loss per week, and a 1,000-calorie daily deficit leads to roughly 2 lb. That means someone burning 2,500 calories a day would need to consume around 1,500 calories to hit a 1,000-calorie gap — or some combination of eating less and moving more to reach the same total.

Why the maths is rarely this clean in practice

Real weight loss is rarely a straight line. The body adapts — metabolism can slow as weight decreases, and weight on the scale is also influenced by water retention, muscle changes, and digestive timing. Many people on GLP-1 medicines notice their appetite changes week to week, making consistent intake harder to predict without tracking. This is why logging what you actually eat — rather than estimating — gives you a much clearer picture of where your deficit genuinely sits.

Is 2 pounds a week realistic on a GLP-1 medicine?

Many people find that reduced appetite on their medicine naturally brings their intake down, which can support a larger deficit without deliberate restriction. However, eating too little — particularly protein — can lead to muscle loss alongside fat loss, which is counterproductive. General guidance suggests prioritising protein at each meal and focusing on calorie quality, not just quantity. For a broader look at how a calorie deficit works on a GLP-1 journey, including what a sustainable deficit looks like over time, that hub covers the full picture.

If you want to understand what a calorie deficit actually means and how to calculate yours from scratch, that page walks through the basics step by step. You can also explore how much of a calorie deficit is needed to lose weight more generally, which covers a range of loss-rate targets beyond the 2 lb mark.

Knowing the target deficit is one thing — consistently hitting it is another, especially when appetite fluctuates from week to week on a GLP-1 medicine. GLP Trackr's AI food photo scan is the fastest way to close the gap between what you intend to eat and what you actually log: point your camera at a meal and the app estimates calories, protein, and macros instantly, without manual searching.

Once you have a daily calorie target in mind, you can set it inside the app and track against it in real time. The daily check-in captures your weight each morning, so you can see whether your week-on-week trend reflects the deficit you are running — and spot early if something isn't adding up. For a deeper look at patterns, the insights tools can surface correlations between your food logging, activity, and weight changes over time.

If your prescriber has discussed a specific intake target with you, the app gives you the tools to follow through on it consistently — it is not a substitute for their guidance, but a way to make that guidance easier to act on every day. For a fuller guide to managing your deficit throughout your GLP-1 journey, visit the calorie deficit hub, which links to related tracking topics including the calorie deficit specifically needed to lose 2 pounds a week and how to adjust as your weight changes.

Ready to start logging? Download GLP Trackr on the App Store or Google Play — your first 7 days are completely free.