The prescription happens quickly. A fifteen minute appointment, a pen or a pill, a pharmacy pickup, and you are officially a GLP-1 patient. What almost never happens in that fifteen minutes is a real conversation about food. Not because your prescriber does not care, but because the system gives them no time to have it.

That conversation is my job. When a new GLP-1 patient sits down with me, our first hour covers the same five things every time, because they are the five things that decide whether the next year goes well. Here they are, exactly as I give them in clinic.

1. Your protein needs just doubled, on the day your appetite halved

The standard protein recommendation for adults is 0.8 grams per kilogram of body weight. It was designed to prevent deficiency in a person eating a full diet. You are no longer that person. On a GLP-1, your total food intake can fall by a quarter to a third almost overnight, while rapid weight loss raises the amount of protein your body needs to hold onto muscle.

In my practice the working target is double the standard, roughly 1.6 grams per kilogram, adjusted for your kidneys, your labs, and your history. That is not a bodybuilding number. It is the amount that tells your body the muscle is still needed. The practical rule that follows: protein goes first on the plate, at every meal, before you spend your small appetite on anything else.

2. The scale will lie to you unless you protect muscle

The trials behind these medications show substantial weight loss, roughly 15 percent of body weight with semaglutide and up to 21 percent with tirzepatide. What the headline numbers do not show is composition. In the body composition sub-studies, somewhere between 25 and 39 percent of the weight lost can be lean mass, and most of that is muscle.

Muscle is not decoration. It is the engine of your metabolism, your insurance against regain, and the strongest predictor of how well you age. Losing forty pounds where a third is muscle is a very different outcome from losing forty pounds of mostly fat, even though the scale reads the same. The protection plan is unglamorous and it works: hit the protein target, and give your muscles a reason to stay with resistance training two to three times a week. Bands and bodyweight count.

3. Side effects are food problems with food answers

Nausea, constipation, and food aversions are the three complaints that bring people to my door, usually with some version of “nobody warned me.” The pattern behind all three is the same: the medication slows your stomach and quiets your appetite, so the eating pattern that worked before now works against you.

Cold foods, smaller portions, lower fat, and liquid protein carry you through nausea weeks. Fiber and fluid, raised deliberately rather than accidentally, handle most constipation before it needs anything stronger. And when food noise goes silent, structure has to replace hunger as the reason you eat, because a body in rapid weight loss that skips meals starts burning the muscle you are trying to keep. Every one of these has a full guide in the archive, written for the week you actually need it.

4. The medication is a tool. The plan is what you build while it works

The most honest thing I can tell you about GLP-1s: they create a window, not an outcome. While appetite is quiet and the food noise is off, changing how you eat is easier than it will ever be again. Patients who use that window to build protein-first meals, regular strength work, and a structure they can keep are the ones who hold their results, whether they stay on the medication for years or eventually taper off.

The ones who simply eat less of their old diet lose weight too. Then the window closes, and nothing underneath has changed. Maintenance is not a phase that starts when you stop the medication. It starts the first week, and we plan for it on day one.

5. Evidence over opinion, always

You are about to hear a lot of confident claims about these medications. Some will come from people selling supplements, some from people selling fear, and some from people selling miracle results. Here is the filter I give every patient: if someone tells you it is all effortless, they are selling something. If someone tells you it is all dangerous, they are also selling something. The truth lives in the trials, the follow-up data, and the honest gray areas in between, and it is almost always more boring and more hopeful than the headline.

That filter is also the promise of this publication. Every essay names its sources, admits what we do not know yet, and ends with something you can actually do.

What happens here

Every Tuesday, a free essay like this one arrives in your inbox. Every Friday, paid members get the practical layer: protocols, worksheets, and once a month my clinical read on the newest GLP-1 and metabolic research. The first one lands this Friday: the 2x Protein Worksheet, the one-page system my patients use to hit their target without counting all day.

The archive already holds 26 guides, from what to eat in nausea weeks to what happens when you stop. All of it is free: https://vitaearete.substack.com/archive

And when you want a plan built around your own labs, medications, and life, that is what my practice is for: https://vitaearete.com

Talk soon,

Jason Fee, MS, RDN, LDN