What Are Maintenance Calories and Why Do They Matter on Mounjaro or Wegovy?

Your daily maintenance calories are shaped by several factors working together: your body size and composition, your age, your biological sex, and how active you are day to day. There is no single universal figure — two people of the same weight can have meaningfully different maintenance needs based on muscle mass and activity level alone.

Why the number shifts over time

As your weight changes on a GLP-1 programme, your maintenance calories change with it. A lighter body generally requires fewer calories to maintain itself, which is one reason many people find their progress slows after an initial period — the body adapts. Recalculating periodically, rather than relying on a figure set at the start, keeps your targets realistic. You can explore what maintenance calories actually mean for you in more detail, or read a practical walkthrough on how to work out your maintenance calories step by step.

Women and maintenance calories

Women's maintenance calories are typically estimated to be lower than men's at the same weight and activity level, largely because of differences in average muscle mass and hormonal factors. Estimates for women also need to account for life stage — perimenopause and menopause can influence how the body uses energy. These are general patterns, not rules; individual variation is wide, and any personal target is best discussed with your prescriber or doctor.

Using maintenance calories as a reference point

Most people on Mounjaro or Wegovy are working in a calorie deficit — eating below maintenance to support gradual weight loss. Understanding your maintenance number makes that deficit intentional rather than accidental. It also helps flag when appetite suppression has pushed intake too low, which can lead to fatigue and muscle loss over time. For a broader look at how a calorie deficit fits into a GLP-1 journey, the calorie deficit guide covers the key principles. You might also find it useful to review what a maintenance calorie target looks like in practice.

Knowing your maintenance calories is only useful if you can actually track what you are eating — and on a GLP-1 journey, food logging needs to be quick and low-effort, especially on days when appetite is low and meals are small.

GLP Trackr's AI food photo scan is built for exactly this: point your camera at a meal and get an instant breakdown of calories, protein, and macros without manually searching every ingredient. For packaged foods, the barcode scanner handles it in seconds. You can also set a personal calorie target inside the app so your daily log always shows how far you are from your goal — whether that goal is a deficit, maintenance, or somewhere in between.

Beyond calories, the app tracks protein separately, which matters because adequate protein intake helps protect muscle mass during weight loss — something that becomes more important the longer you are on a GLP-1 medicine. The daily check-in also captures energy levels, so if low calorie intake is affecting how you feel, that pattern becomes visible over time rather than going unnoticed.

If you want a clear, consistent picture of your intake relative to your maintenance calories, snap your meals in GLP Trackr and let the numbers build up automatically. Available free on the App Store and Google Play — start a 7-day trial at no cost and see how straightforward food tracking can be.

GLP Trackr is a tracking tool and does not provide personalised nutrition prescriptions or medical advice. For guidance on the right calorie target for your individual situation, speak with your prescriber or doctor — they can take your full health history into account.