What GLP-1 users actually eat: 753 calories and too little protein

You already know people eat less on GLP-1 medications. A 2026 study put a hard number on it, and the number is smaller than most people expect. Adults on Ozempic, Wegovy and similar drugs were eating an average of just 753 calories a day, with barely a third of the protein their bodies needed to hold on to muscle.

TL;DR

A 2026 study tracked what 387 GLP-1 users actually ate and found an average of 753 calories and 33 g of protein a day. About 97% fell short of the protein they needed to protect muscle. The drugs are doing exactly what they are meant to do by cutting appetite, but that same appetite drop leaves a serious protein and nutrient gap that food alone often cannot close.

What the study actually measured

The research, published in the Journal of Translational Medicine in April 2026, is one of the first to look not at what GLP-1 users are told to eat, but at what they actually put on their plates. Researchers tracked 387 adults with overweight or obesity, about 80% of them women, average age 35, all taking either a GLP-1 medication like semaglutide or a dual GIP/GLP-1 drug like tirzepatide. Each person kept a food diary covering one weekday and one weekend day, then that intake was analysed for calories, protein and other nutrients.

The headline findings are stark:

• 753 calories a day on average. That is the mean total energy intake across the group, well under half of what most adults eat.
• 33 g of protein a day. Against a target of roughly 75 to 90 g, most users were eating less than half the protein they needed.
• About 97% missed the protein target. Nearly everyone in the study fell short, not a handful of outliers.
• Weekday intake ran 170 calories higher than weekends. A small but consistent pattern that hints at how routine, not hunger, drives eating on these drugs.

None of this means the medication is failing. A big drop in intake is the whole mechanism behind GLP-1 weight loss results. The problem is what gets lost along with the calories.

Why 753 calories is a nutritional problem, not just a small meal plan

To put 753 calories in context: most adults eat somewhere between 1,800 and 2,400 calories a day. Medically supervised very-low-calorie diets, the kind run under a doctor's watch, usually sit around 800 calories and come with mandatory nutrient support. Many GLP-1 users are eating at or below that level without anyone checking whether the basics are covered.

When intake drops that low, it is not only calories that shrink. Every vitamin and mineral your body needs still has to fit inside those 753 calories, and there simply is not room. This is the mechanism behind the nutrient deficiency on GLP-1 that keeps showing up in the research: not because the drugs strip nutrients out directly, but because you are eating so little that the gaps open on their own. We covered how those gaps widen over time in our piece on how nutrient deficiencies nearly double between month 6 and month 12.

The protein gap is where the real damage happens

Of all the numbers in this study, the protein figure is the one to worry about. The average intake was 33 g a day. The target the researchers used, at least 1.2 g of protein per kg of target body weight, works out to about 75 to 90 g for most people. So the typical user was eating less than half the protein they needed, and roughly 97% of the group missed the mark.

Here is why that matters more than it sounds. When you lose weight quickly, some of what you lose is always muscle, not just fat. On GLP-1 medications that share can be large, with estimates that 20 to 50% of the weight lost is lean tissue. Protein is the raw material your body uses to defend that muscle. Starve it of protein while it is already shedding weight fast, and muscle loss on Ozempic and similar drugs accelerates. Over months, that can mean weakness, slower metabolism and, in older users, a real risk of sarcopenia, the age-related loss of muscle and strength.

The study authors were direct about the fix. They called for routine dietary education focused on protein adequacy and micronutrient sufficiency to go hand in hand with the medication, specifically to prevent deficiencies and muscle loss. In other words, the drug handles appetite, but someone still has to handle nutrition, and right now almost nobody is. We go deeper on the muscle side in our guide to muscle loss and protein intake on GLP-1.

Fiber told a similar story of scarcity. Average fiber intake landed at about 7 g a day, far below the 25 to 30 g usually recommended for general health, which tracks with the constipation and sluggish digestion many GLP-1 users report.

How to hit your protein target when you can barely eat

The practical problem is obvious. If your appetite has collapsed, being told to eat 90 g of protein can feel impossible. The trick is to make the little you do eat work harder. Here is how:

• Put protein first at every meal. Eat the protein on your plate before anything else, while your small appetite is still open. Carbs and fats can fill whatever room is left.
• Use a shake to close the gap, not replace meals. A whey or plant protein shake of 20 to 40 g is an easy way to add protein on days when solid food feels like too much. Food first, shake to top up.
• Spread protein across the day. Three or four smaller protein hits are easier to stomach and better for muscle than one large serving you cannot finish.
• Lift something heavy a few times a week. Resistance training is the signal that tells your body to keep muscle rather than burn it. Protein plus training beats either one alone.
• Cover the micronutrient gaps you cannot eat your way to. At 700 to 800 calories a day, a targeted supplement is often the only realistic way to reach your daily vitamins and minerals.

If you want the specific numbers behind each of these, our GLP-1 supplement protocol lays out the doses, from protein to creatine to vitamin D, that current research points to. This is exactly the territory GLP-1 Shield is built for: covering the protein and nutrient gaps that open when your food intake drops this far, so weight loss does not quietly cost you muscle and energy.

What this study can and cannot tell you

Read the numbers with the right amount of caution. This was a preliminary study built from self-reported food diaries covering just two days, in a group that skewed young and female, and it measured what people ate, not their long-term health outcomes. Two days of diaries can miss the ups and downs of a normal week, and people tend to under-record what they eat. So treat the exact figure of 753 calories as a snapshot, not a fixed law.

What makes it credible is that it points the same direction as everything else researchers are piecing together. Trial after trial has struggled to capture what GLP-1 users actually eat, a gap we wrote about in why GLP-1 trials rarely measured what you eat. This study is one of the first to fill that blank with real intake data, and the picture it paints, very low calories and far too little protein, lines up with the muscle loss and deficiency patterns seen elsewhere. The signal is consistent even if the precise numbers will shift as bigger studies follow.

The takeaway is simple and worth acting on. The medication does its job by cutting how much you eat. Protecting your muscle, energy and nutrient levels while that happens is a separate job, and it is yours. Get a baseline blood panel, make protein the non-negotiable, and fill the gaps you cannot eat your way to.

Frequently asked questions

How many calories do people eat on Ozempic or Wegovy?

In a 2026 study of 387 adults on GLP-1 or dual GIP/GLP-1 medications, average intake was just 753 calories a day. That is well under half of what most adults eat normally, and it reflects how strongly these drugs suppress appetite. Intake varies a lot between people and days, but very low totals like this are common in the first months.

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

The study used a target of at least 1.2 g of protein per kg of target body weight, which works out to roughly 75 to 90 g a day for most people. Actual intake averaged only 33 g, and about 97% of users fell short. Hitting the target protects muscle while you lose weight, so protein is the single most important thing to prioritise at every meal.

Why am I losing muscle on Ozempic or Wegovy?

Rapid weight loss always includes some lean tissue, not just fat, and on GLP-1 medications a large share of the loss can be muscle. Eating far too little protein, as most users in this study did, makes it worse because your body cannot rebuild muscle without the raw material. Resistance training plus enough protein is the proven way to hold on to muscle.

Do I need supplements if I eat so little on GLP-1?

When you eat only 700 to 800 calories a day, it is very hard to reach your daily vitamins, minerals and protein from food alone. That is exactly the gap targeted supplements are meant to fill. Get a blood panel first so you know which nutrients are actually low for you, then cover the gaps with your prescriber's input.