Eating 1400 Calories a Day on a GLP-1 Medicine: What to Know

A calorie intake around 1,400 kcal per day sits within a moderate deficit range for many adults — enough to support gradual fat loss while still providing room for adequate protein, fibre, and micronutrients. Whether it is appropriate for you depends on several factors:

• Sex and body size: General guidance suggests that adult women typically need roughly 1,600–2,000 kcal per day at maintenance, and adult men somewhat more. A 1,400 kcal target therefore represents a meaningful deficit for most people, which is why it is commonly associated with calorie needs for women on a weight-loss programme.
• Activity level: Burning 500 or 1,000 additional calories through movement in a day increases your total energy expenditure, which affects how large your deficit actually is. Someone walking 15,000 steps and doing strength training has very different needs from someone largely sedentary.
• GLP-1 appetite effects: Reduced appetite on these medicines can make it easy to fall well below 1,400 kcal — sometimes into ranges (such as consuming only 500 calories a day) that make it harder to meet protein targets and may increase the risk of muscle loss. This is a common concern worth discussing with your healthcare professional.

For a broader look at how to set a calorie target that creates a sustainable deficit, the calorie deficit guide covers the key principles. You can also explore how calories work on a GLP-1 journey and what typical daily targets look like for different starting points.

Prioritising Protein Within 1,400 Calories

When calories are limited, protein becomes especially important. Many people on GLP-1 medicines aim for somewhere in the region of 100–140 g of protein per day — though the right target for you is something to agree with your prescriber or a registered dietitian. Good protein sources that tend to sit well when appetite and tolerance are reduced include eggs, Greek yoghurt, cottage cheese, white fish, chicken breast, tofu, and legumes. Building meals around protein first, then adding vegetables and a small amount of complex carbohydrates, is a practical structure many people find useful at this calorie level. For guidance specific to daily calorie needs for women, there is a dedicated page covering that topic in more detail.

What About Very Low Intakes?

Consuming only 500 calories a day for any sustained period is generally considered too low for most adults and is not something to pursue without direct clinical supervision. Even at 1,400 kcal, some people find certain days harder than others — and that is normal. The goal is consistency over time, not perfection on any single day.

Hitting a 1,400-calorie target consistently is harder than it sounds when appetite is unpredictable — some days food noise drops away almost entirely, others it returns. GLP Trackr's AI food photo scan is the quickest way to stay on top of it: point your camera at a meal and get an instant calorie and protein breakdown without manually searching every ingredient. It takes seconds, which matters when appetite is low and cooking motivation is limited.

Beyond logging individual meals, you can set a daily calorie target and a protein goal inside the app, then watch them fill throughout the day in real time. The daily check-in captures not just what you ate but how your appetite and energy felt — useful data to bring to a conversation with your prescriber if you are regularly struggling to reach 1,400 kcal or regularly overshooting it.

If you would like to track your intake consistently alongside your GLP-1 journey, GLP Trackr is free to try for 7 days — download it on the App Store or Google Play and start logging today.

A note on targets: GLP Trackr helps you observe and record your intake — it is not a substitute for personalised advice. If you have concerns about whether 1,400 calories a day is right for your situation, please discuss them with your prescriber or doctor, who can take your full health history into account.