How Many Calories Should You Eat on Ozempic or Wegovy?

Last updated: June 2026

If you're asking how many calories you should eat on Ozempic or Wegovy, you've probably noticed the strangest part of these medications: the hunger just goes quiet. Some days you look up and it's mid-afternoon and you've barely eaten, and you genuinely can't tell whether that's fine or a problem. That uncertainty is the part almost nobody warns you about.

Here's the honest answer up front. On a GLP-1 medication, the usual dieting problem flips. Most people don't struggle to eat less. They struggle to eat enough, and to eat the right things in the smaller window of appetite they have left. Get your calorie floor and your protein right and you protect your muscle, your energy, and your results. This guide walks through the numbers, with sources, and a tool like Hoot can take the guesswork out of hitting them when your appetite no longer tells you much.

A quick medical note. This article is general education, not medical advice, and it does not cover medication dosing. Your calorie and protein targets on a GLP-1 should be set with the clinician who prescribed it, especially if you have diabetes, kidney disease, or take other medications.

Quick answer

Most adults on Ozempic or Wegovy eat about 1,200 to 1,500 calories a day if they are women and 1,500 to 1,800 if they are men, and should not drop below 1,200 (women) or 1,500 (men) without medical supervision. Pair that intake with 1.2 to 1.6 grams of protein per kilogram of body weight to protect muscle. Your exact target depends on your size, age, and goal, and is best set with your prescriber.

Key takeaways

• On a GLP-1, eating too little is the bigger risk. The medication can cut calorie intake by about 24%, so most people need to defend a floor, not chase a tighter ceiling.

• Don't go below 1,200 calories (women) or 1,500 (men) on your own. Lower intakes belong in a medically supervised program, not a solo experiment.

• Protein protects your muscle. Aim for 1.2 to 1.6 grams per kilogram of body weight, higher than the standard recommendation, to keep weight loss coming mostly from fat.

• Your target is personal. Body size, age, activity, and your prescriber's plan all move the number. Use the math here as a starting point, not a prescription.

How Many Calories Should You Eat on Ozempic or Wegovy?

Most adults on Ozempic or Wegovy should eat between 1,200 and 1,800 calories a day, with women generally landing in the 1,200 to 1,500 range and men in the 1,500 to 1,800 range. These are starting points, not hard rules, and the right number for you depends on your body size, age, activity level, and how much weight you have to lose. The firmer rule is the floor underneath them.

Going below roughly 1,200 calories a day for women or 1,500 for men is not something to do on your own. Very low calorie diets, generally defined as under 800 calories a day, can be appropriate for some people, but only inside a structured, medically supervised program. The appetite suppression from a GLP-1 can quietly push you under these floors without you noticing, which is exactly why the number is worth tracking.

How to Calculate Your Calorie Target on a GLP-1

To calculate your calorie target on a GLP-1, start from the calories your body burns at rest, add your activity, subtract a moderate deficit, then check the result against the floor. The most validated way to estimate that resting number is the Mifflin-St Jeor equation, the same formula most dietitians and tracking apps use.

If you want the equation itself broken down step by step, see our guide to the Mifflin-St Jeor formula. Here is the short version, worked for one example.

Take a 45-year-old woman who is 5 feet 5 inches (165 cm) and 180 pounds (82 kg). Here is how the math runs.

A 500-calorie daily deficit works out to roughly one pound of fat loss a week, a pace most clinicians consider sustainable. Notice that the deficit math lands just above the 1,200-calorie floor. If your own numbers fall below it, you hold at the floor and accept slightly slower loss rather than dropping lower. And because the medication makes that deficit easy to reach, the work usually isn't cutting more. It's making sure you actually eat up to the target.

For the same math without the medication context, including every activity multiplier, our walkthrough of how many calories to eat to lose weight covers it in full.

Why Eating Too Little on a GLP-1 Is the Real Risk

Eating too little on a GLP-1 is a genuine risk because the medication is so effective at reducing appetite that intake can fall well below what your body needs. In a controlled study, once-weekly semaglutide cut participants' total daily calorie intake by 24% compared with placebo, without them consciously trying to eat less (Blundell et al., 2017). For many people that is a helpful nudge. For some, it tips into eating too little to stay healthy.

Once-weekly semaglutide reduced total calorie intake by 24% compared with placebo. Source: Blundell et al., Diabetes, Obesity and Metabolism, 2017.

The biggest concern with chronically under-eating is muscle. When you lose weight quickly, some of it comes from lean tissue, not just fat. Body composition analyses of semaglutide trials suggest that without enough protein and resistance training, a meaningful share of the weight lost, by some estimates up to around 40%, can come from lean mass. The encouraging flip side is that when people do get adequate protein and strength training, the same line of research shows loss skews strongly toward fat. That lever is in your hands.

Persistent under-eating carries other costs too. Too few calories and nutrients over time is associated with gallstones, fatigue, hair thinning, nutrient deficiencies, and electrolyte problems. None of this means the medication is the enemy. It means the smaller appetite it gives you has to be spent wisely, on enough protein and real food rather than on almost nothing at all.

How Much Protein Do You Need on Ozempic or Wegovy?

On Ozempic or Wegovy, aim for about 1.2 to 1.6 grams of protein per kilogram of body weight per day, which is higher than the standard 0.8 grams per kilogram recommended for the general adult population. Obesity-medicine guidance raises the target specifically to offset the muscle-loss risk that comes with rapid weight loss. A simple practical version is to get 20 to 40 grams of protein at each meal, starting with breakfast.

Here is what those targets look like at a few body weights.

Protein is the single most important macro to defend on a GLP-1, and our guide to how much protein you actually need breaks down easy ways to reach it. The challenge on these medications is rarely wanting to eat protein. It's fitting it into a much smaller appetite, which is why protein-first meals matter more than ever.

Tracking Calories and Protein on a GLP-1 (Where Hoot Fits)

When your appetite no longer tells you whether you've eaten enough, tracking becomes your feedback loop instead of hunger. The trouble is that classic calorie counting is tedious, and on a GLP-1 you may not feel like doing much of anything around food. This is where a low-friction tracker earns its place.

Hoot is built for exactly that gap. You can log a meal by snapping a photo, speaking a sentence, or typing a line, so confirming you hit your protein and your calorie floor takes seconds rather than a spreadsheet. The Nutrition Score rates the quality of what you ate on a 1 to 100 scale, which nudges you toward protein and real food in the limited eating window you have. It syncs with Apple Health, and the focus stays on whether you reached enough, not only on staying under a cap. Hoot doesn't replace your prescriber, but it gives you and your care team a clear record of what you're actually eating.

Your next step is simple. Estimate your maintenance calories, set a moderate deficit, confirm the result sits at or above your floor, and build each small meal around protein. Then check the number with the clinician who prescribed your medication. The appetite suppression is doing the hard part. Your job is to make every bite count, and to make sure you eat enough of them.

Frequently Asked Questions

Is 1,200 calories enough on Ozempic?

For many women, 1,200 calories a day is the lowest reasonable floor, and it can be enough for steady weight loss, though it is on the low end. It should leave room for adequate protein and nutrients, which gets hard below that point. If your calculated target falls under 1,200, treat that as a signal to involve your prescriber rather than simply eating less.

What happens if you don't eat enough on Wegovy?

Chronically under-eating on Wegovy can accelerate muscle loss, leave you fatigued, and raise the risk of issues like gallstones, hair thinning, and nutrient deficiencies. The medication suppresses appetite so effectively that falling short is easy to do without noticing. Eating enough protein and not dropping below your calorie floor are the main safeguards.

How many calories should I eat to lose weight on semaglutide?

Estimate your maintenance calories, then subtract about 500 a day for roughly a pound of weight loss per week, never going below 1,200 (women) or 1,500 (men) without supervision. For most adults that lands somewhere between 1,200 and 1,800 calories. Because semaglutide reduces appetite so much, the practical task is usually eating up to that target, not under it.

Do I need to count calories on Ozempic?

You don't strictly have to, but some form of tracking helps, because the appetite suppression removes the hunger cues you would normally rely on. Many people track loosely just to confirm they are hitting their protein and not slipping under their calorie floor. A photo or voice-based log makes this far less tedious than traditional calorie counting.

How much protein should I eat on a GLP-1?

Aim for roughly 1.2 to 1.6 grams of protein per kilogram of body weight per day, or about 20 to 40 grams per meal. That is higher than the general recommendation and is meant to protect muscle while you lose weight quickly. Prioritizing protein at each meal matters more on a GLP-1 because your total eating window is smaller.

Sources

Blundell J, Finlayson G, Axelsen M, et al. Effects of once-weekly semaglutide on appetite, energy intake, control of eating, food preference and body weight in subjects with obesity. Diabetes, Obesity and Metabolism, 2017. onlinelibrary.wiley.com

Wilding JPH, Batterham RL, Calanna S, et al. Once-weekly semaglutide in adults with overweight or obesity (STEP 1). New England Journal of Medicine, 2021. nejm.org

Mifflin MD, St Jeor ST, Hill LA, et al. A new predictive equation for resting energy expenditure in healthy individuals. American Journal of Clinical Nutrition, 1990. academic.oup.com

Academy of Nutrition and Dietetics. Guidance on very low calorie diets and medical supervision. eatright.org

National Institutes of Health (PMC). Unintended consequences of obesity pharmacotherapy: a nutritional approach to ensuring better patient outcomes, 2024. ncbi.nlm.nih.gov

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Disclaimer: Hoot provides general nutrition information for educational purposes only. It is not medical advice and does not address medication dosing. GLP-1 medications such as Ozempic and Wegovy should be managed by a qualified healthcare provider. Consult your prescriber or a registered dietitian before changing your calorie intake, especially if you have diabetes, kidney disease, or another medical condition.