How Many Calories Should I Consume Each Day?

Your daily calorie needs are shaped by two main factors: how much energy your body burns at rest (your basal metabolic rate) and how much you add through movement and daily activity. Together these are often called your total daily energy expenditure (TDEE).

Why a deficit matters for weight loss

Weight loss generally happens when you consistently take in fewer calories than your body uses. A moderate deficit — often cited in general nutritional guidance as roughly 500 kcal below TDEE — is commonly used as an educational starting point, though individual needs differ. Going too low can make it harder to meet protein and micronutrient needs, which matters especially on a GLP-1 medicine when appetite is already reduced.

Protein and calories on a GLP-1 journey

Many people on Mounjaro or Wegovy find their overall appetite decreases, which can make hitting adequate protein trickier. Protein supports muscle retention during weight loss, so knowing your calorie target alongside your protein goal gives a more complete picture. For a practical look at how daily calorie needs are generally estimated, that guide covers the key variables in more detail.

What about individual meals — like lunch?

If you want to portion your calories across the day, a rough approach is to allocate roughly 25–35% of your daily total to a main meal like lunch, leaving room for breakfast, dinner, and snacks. This is a general educational framework, not a personalised prescription — your own hunger cues (which GLP-1 medicines often change significantly) are a useful guide too. For more on how calories break down day to day, see understanding your calorie numbers.

Using a calculator as a guide

An online calorie calculator uses inputs like your age, sex, weight, height, and activity level to estimate your TDEE, then suggests a deficit range for weight loss. These tools give a useful estimate — not a precise prescription. Our GLP-1 calorie calculator is built with the specific context of a Mounjaro or Wegovy journey in mind.

Knowing your calorie target is only half the picture — staying on top of it day to day is where most people find it challenging, especially when appetite and portion sizes are shifting on a GLP-1 medicine.

GLP Trackr's AI food scan lets you point your phone camera at a meal and get an instant calorie and protein breakdown — no manual entry required. When appetite is low and meals are smaller, that speed makes a real difference to whether logging actually happens. You can also search foods or scan a barcode for packaged items.

Once your daily calorie and protein targets are set in the app, your morning check-in and food log feed into a running daily total, so you can see at a glance whether you're on track — without having to do the arithmetic yourself. The insights view can also show you how your calorie intake relates to your weight trend over time, which is genuinely useful data to bring to a conversation with your prescriber or dietitian.

For a broader look at calorie guidance on a GLP-1 journey, the how many calories should I eat guide covers common questions in one place.

A note on targets: calorie figures from any calculator — including ours — are general estimates. Always discuss your specific nutrition goals with your prescriber or a registered dietitian, particularly if you have any underlying health conditions. GLP Trackr is a tracking tool, not a clinical nutrition service.

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