How Many Calories Should I Eat on Ozempic or Zepbound?

There is no official calorie number for Ozempic, Wegovy, or Zepbound. The Wegovy and Zepbound labels pair the drug with a reduced-calorie diet and increased physical activity, and many label trials used about a 500-calorie daily deficit. A 2025 joint advisory flags intakes under 1,200 calories (women) or 1,800 (men) as a nutrient risk. Your prescriber sets your number.

What the FDA labels actually say about calories

Start with what is on paper, because a lot of advice online is not. The Wegovy label says the drug "is indicated in combination with a reduced calorie diet and increased physical activity." The Zepbound label uses almost the same words: "indicated in combination with a reduced-calorie diet and increased physical activity." Neither label gives you a daily calorie number to eat.

Ozempic is different. It contains semaglutide, the same molecule as Wegovy, but its FDA label covers type 2 diabetes, not weight management. Its first indication reads: "as an adjunct to diet and exercise to improve glycemic control in adults with type 2 diabetes mellitus." If you were prescribed Ozempic, your plan comes from your prescriber, and the weight-management wording above belongs to Wegovy and Zepbound.

What the labels do show is how the clinical trials handled food. In several Wegovy studies, "all patients received instruction for a reduced-calorie diet (approximately 500 kcal/day deficit) and increased physical activity counseling (recommended to a minimum of 150 min/week)." Zepbound's main weight trials used the same idea: "reduced-calorie diet (approximately 500 kcal/day deficit)." Some trials used fixed numbers instead. One Wegovy study started with an 8-week diet of "1,000 to 1,200 kcal/day," then 1,200 to 1,800. One Zepbound study had a 12-week lifestyle lead-in, delivered by a dietitian, with instruction to eat "approximately 1,200 kcal/day (females) or 1,500 kcal/day (males)."

Those are supervised research protocols, not instructions for you, but they show the shape: a moderate deficit from your own baseline.

Source	What it says about calories
Wegovy label, indications	"reduced calorie diet and increased physical activity" (no number)
Zepbound label, indications	"reduced-calorie diet and increased physical activity" (no number)
Ozempic label, indications	"adjunct to diet and exercise" for type 2 diabetes (no number)
Wegovy and Zepbound trial descriptions	Often "approximately 500 kcal/day deficit"
2025 joint advisory	Nutrient risk rises below 1,200 kcal/day (women) or 1,800 (men)

A plain note: this is general information, not medical advice. Talk to your prescriber or a registered dietitian before setting or changing a calorie target, especially if you have diabetes, kidney disease, or a history of disordered eating.

Why appetite changes the question

On most diets, the hard part is eating less. On these drugs, the labels describe that part as built in. Both the Wegovy and Zepbound labels say the drug "decreases calorie intake" and that "the effects are likely mediated by affecting appetite."

The 2025 joint advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society puts a size on it: "observed caloric reductions of 16%–39%." It then names the risk: "This large, rapid reduction can lead to insufficient intakes of essential vitamins and minerals, especially at energy intakes <1200 kcal/d for females and < 1800 kcal/d for males."

So for many people, the question flips from "how do I eat less" to "am I still eating enough?"

How to estimate a starting target

Because the labels give no number, a reasonable place to start is the same math any calorie target uses: your TDEE (total daily energy expenditure) minus a moderate deficit. Our TDEE guide explains the Mifflin-St Jeor formula in full, and the calorie deficit calculator runs it for you with a gentle (250), standard (500), or aggressive (750) deficit. The standard 500 lines up with the deficit described in many of the label trials.

Then bring the number to your prescriber, who knows your history and medications and may adjust it.

A worked example

Two example people, using Mifflin-St Jeor and the activity multipliers from the TDEE guide. This is arithmetic, not a recommendation.

Example 1: a 45-year-old woman, 165 cm, 95 kg, lightly active.

• Resting burn: 10 x 95 + 6.25 x 165 - 5 x 45 - 161 = 950 + 1,031.25 - 225 - 161 = 1,595 calories
• TDEE: 1,595.25 x 1.375 = 2,193.5, rounded to 2,193 calories
• Standard deficit: 2,193 - 500 = 1,693 calories a day

Example 2: a 50-year-old man, 180 cm, 110 kg, sedentary.

• Resting burn: 10 x 110 + 6.25 x 180 - 5 x 50 + 5 = 1,100 + 1,125 - 250 + 5 = 1,980 calories
• TDEE: 1,980 x 1.2 = 2,376 calories
• Standard deficit: 2,376 - 500 = 1,876 calories a day

Deficit	Woman (TDEE 2,193)	Man (TDEE 2,376)
Gentle (250)	1,943	2,126
Standard (500)	1,693	1,876
Aggressive (750)	1,443	1,626
Advisory nutrient-risk line	under 1,200	under 1,800

Notice the man's aggressive option. At 1,626 calories, he is already under the advisory's 1,800 line for males, even though 750 sounds modest. The lines are different for men and women, so the same deficit can land very differently.

Now add appetite. If either person was eating about maintenance before starting and their intake then dropped by the advisory's 16% to 39% range, the woman would land between about 1,842 and 1,338 calories a day (2,193 x 0.84 and 2,193 x 0.61), and the man between about 1,996 and 1,449 (2,376 x 0.84 and 2,376 x 0.61). At the high end of that range, the man is well under 1,800 without trying. That is the scenario worth catching early.

Why eating far too little is a problem

Lean mass goes with the fat. Both labels say the drug "lowers body weight with greater fat mass loss than lean mass loss," which means some lean mass is lost too. The joint advisory cites the STEP 1 semaglutide trial: of an average 13.6 kg lost, "8.3 kg (62%) was fat mass and 5.3 kg (38%) was lean body mass." It adds that lean mass loss "is also affected by the degree of calorie restriction, overall rapidity of weight reduction, and presence or absence of strength training exercises."

Nutrients run short. The advisory lists "iron, calcium, magnesium, zinc, and vitamins A, D, E, K, B1, B12, and C" as examples of nutrients of concern when intake drops.

Bone can be affected. The advisory says weight reduction that is "substantial (≥14%) and rapid (over 3–4 months) is associated with significant bone loss, whereas more moderate and slower weight reduction may better preserve bone mass."

Long gaps without food add up. The advisory warns that people on these drugs "may also practice unintended intermittent fasting, due to not being hungry," and that "long periods of fasting without sufficient protein intake or dietary variety can lead to nutritional inadequacy, clinical nutrient deficiencies, loss of fat-free mass, and reduced resting energy expenditure."

Protein is the biggest single piece of this, and we cover it in detail in How to Eat Enough Protein on Ozempic, Wegovy, or Zepbound. The short version from the advisory: protein intake "should not fall below 0.4–0.5 g/kg/day," and an absolute target of "80–120 g/day" may help adherence. For the 95 kg woman above, that floor is 38 to 47.5 grams; your clinician sets the actual target.

Signs you may be under-eating to raise with your clinician

The joint advisory lists what it calls "signs of frank nutrient deficiency": "fatigue beyond expected levels, excessive hair loss, skin flakiness or itching, muscle weakness, poor wound healing, and unusual bruising." Do not self-diagnose; write them down and bring them to your prescriber.

It also describes a pattern worth recognizing: "Some individuals get caught in a cycle of not eating due to nausea, which worsens the symptoms, which then further reduces the likelihood of eating." Nausea, it notes, "often occurs in the morning or after longer periods without eating."

Fluids matter too. Both labels warn about acute kidney injury and say most reported cases "occurred in patients who experienced gastrointestinal adverse reactions leading to dehydration such as nausea, vomiting, or diarrhea." The labels tell prescribers to advise patients "to take precautions to avoid fluid depletion."

Meal structure when appetite is low

The advisory's eating guidance is practical and short:

• Small, regular meals. It suggests "a small breakfast and then additional small meals every 3–4 h while drinking adequate fluids," and lists "regular, small meals at consistent times" as a habit to encourage.
• Avoid large meals. "Vomiting is more likely to occur with large meals," and it lists "consumption of large meals" as something to minimize.
• Lighter, nutrient-dense options. "Smoothies and protein drinks with fruits, vegetables, and various unsweetened milks or yogurt; cottage cheese and soups" are, it says, "often more appealing" than heavier foods.
• Protein first. "Protein-rich foods can be consumed first in a meal to increase the likelihood of sufficient consumption."
• Reminders. "If changes to food composition are not enough, setting an alarm or other reminder to eat can be helpful."

It also pairs food with movement: "regular strength training at least three times weekly plus at least 150 min of moderate-intensity aerobic exercise weekly to preserve muscle and bone mass." Check with your clinician before starting a new program.

Tracking roughly, and why it is worth it

You do not need to weigh every bite. The advisory itself recommends "regular re-assessment of dietary intake and hydration, for example, using food logs and/or food photos." The point is a rough, honest picture: are you landing near your target most days, or quietly drifting well under it?

Rough tracking catches the two problems that matter: calories sliding far below plan, and protein falling off. How to Track Calories Without Weighing Food covers estimating portions by eye, and Common Food Logging Mistakes covers what people tend to leave out.

Logging small meals in Nouri

I built Nouri because of friction. With my first tracker, the numbers were fine, but logging a normal dinner took several minutes, and after a long day I just would not do it. Small, scattered meals make that worse. Five mini-meals a day is five chances to skip a log, and the one you skip is often the one that mattered.

In Nouri, a log is one sentence. Type "half a cup of cottage cheese" like a note, say it, snap a photo, or ask Siri from the lock screen. Calories and macros come back instantly with per-item reasoning, and you can add context like "small portion" and recalculate. Smart reminders help with the days you forget to log at all.

Nouri's own target uses the same math as the example above: Mifflin-St Jeor, your activity multiplier, minus 500 for a weight loss goal, and never below 1,200 as a safety floor. If your prescriber gives you a different number, follow theirs.

The weekly Nouri Report, part of Nouri Premium, shows your average calories and macros against your targets and your days on target. That week-level view is useful to bring to an appointment. Nouri is a general food tracker. It is not designed for any medication and does not replace your prescriber.

When to talk to your prescriber

• Before you pick a calorie target, and whenever your weight, activity, or dose changes.
• If you regularly eat far under your target, or under the advisory's 1,200 (women) or 1,800 (men) lines, without meaning to.
• If you notice any of the deficiency signs the advisory lists: unusual fatigue, excessive hair loss, skin flakiness or itching, muscle weakness, poor wound healing, or unusual bruising.
• If you have "severe or persistent gastrointestinal symptoms," which the labels tell patients to report.
• If you have diabetes and take insulin or a sulfonylurea. The labels note these combinations "may increase the risk of hypoglycemia."

Common mistakes

Copying a number from social media. Our two examples are nearly 200 calories apart on the same deficit, and real people vary far more. Run your own numbers, then confirm them with your prescriber.

Skipping meals instead of shrinking them. Long gaps feed the nausea cycle the advisory describes. A small meal beats no meal.

Tracking calories but not protein. Calories fall on their own for many people. Protein is the number that drifts. See How to Track Macros.

FAQ

How many calories should I eat on Ozempic?

There is no official number. Ozempic is labeled for type 2 diabetes "as an adjunct to diet and exercise," and your prescriber sets your plan. A common starting estimate is your TDEE minus a moderate deficit, which you then confirm with them.

How many calories should I eat on Zepbound?

Zepbound's label says to use it with "a reduced-calorie diet and increased physical activity" but gives no daily number. Its two main weight trials used about a 500-calorie daily deficit. Your prescriber can tailor a target to you.

How many calories should I eat on Wegovy?

The Wegovy label pairs it with "a reduced calorie diet and increased physical activity," with no set number. Several of its trials instructed about a 500-calorie daily deficit. Use that as a starting conversation, not a prescription.

Is 1,200 calories enough on a GLP-1?

The 2025 joint advisory says nutrient shortfalls are more likely at "<1200 kcal/d for females and < 1800 kcal/d for males." For men, 1,200 is well under that line. Whether a given number suits you is your prescriber's call.

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

The advisory describes risks including vitamin and mineral shortfalls, muscle and bone loss, and a cycle where not eating worsens nausea. It lists signs such as fatigue beyond expected levels and excessive hair loss. Your clinician can check for these.

Should I count calories on Ozempic?

You do not have to count precisely, but the joint advisory recommends ongoing review of what you eat, "using food logs and/or food photos." Rough tracking shows whether you are eating far below plan or short on protein.

What should I eat when I have no appetite on a GLP-1?

The advisory suggests small, regular meals every 3 to 4 hours, protein-rich foods first, and lighter options like smoothies, yogurt, cottage cheese, and soups. Our protein on GLP-1s guide lists protein-dense small portions.

How much protein should I eat on Ozempic?

The advisory notes the RDA is 0.8 g/kg a day, that 1.2 to 1.6 g/kg has been proposed during weight loss, and that intake should not fall below 0.4 to 0.5 g/kg. Your clinician or dietitian sets your number.

Why am I so tired on Ozempic?

Fatigue shows up in the trial side-effect data the joint advisory summarizes, and the advisory also names "fatigue beyond expected levels" as a possible sign of nutrient deficiency. It can have several causes, so it is worth raising with your prescriber rather than guessing.

What is the easiest way to track calories on Ozempic or Zepbound?

Log each small meal as one quick sentence right after you eat it. In Nouri, you can say "Hey Siri, track food in Nouri," then "a cup of tomato soup," and calories, protein, and what is left for the day appear without opening the app. A weekly look at your averages shows whether you are drifting low.

There is no label number, so your calorie target is a starting estimate you build with your prescriber: TDEE minus a moderate deficit, watched for drifting too low. Run your numbers in the calorie deficit calculator, read up on protein during GLP-1 therapy, and if logging is the part you skip, try Nouri for a week of quick one-sentence logs.

Sources

• WEGOVY (semaglutide) prescribing information, sections 1, 2, 5, 12.2, 14, and 17, DailyMed, dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=ee06186f-2aa3-4990-a760-757579d8f77b (checked October 5, 2026)
• ZEPBOUND (tirzepatide) prescribing information, sections 1, 2, 5, 12.2, 14, and 17, DailyMed, dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=487cd7e7-434c-4925-99fa-aa80b1cc776b (checked October 5, 2026)
• OZEMPIC (semaglutide) prescribing information, section 1 (indications), DailyMed, dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=adec4fd2-6858-4c99-91d4-531f5f2a2d79 (checked October 5, 2026)
• Mozaffarian D et al., "Nutritional priorities to support GLP-1 therapy for obesity: A joint Advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society," Obesity, 2025;33(8):1475-1503, doi:10.1002/oby.24336, pmc.ncbi.nlm.nih.gov/articles/PMC12304835 (checked October 5, 2026)