Retatrutide Truth: Why Using GLP-1s Doesn't Make You Weak

You have to have a little bit of fucking empathy, man.

That was my answer to a question someone sent me, and the question was this: My brother is about 30% body fat. Is Retatrucide a good approach for him to start with if he wants to lose weight? There are a lot of creators out there, coaches, fitness experts, who speak out against GOP ones, and they say that they're a shortcut.

Before I answer whether the drug is a good starting point, you need the whole map of what actually happens when a person loses a large amount of weight, because the shortcut argument only makes sense if you believe fat loss is a straight line held together by willpower.

It isn't a straight line, and the reason has a name and a mechanism.

Your brain runs body fat the way a thermostat runs room temperature. Fat tissue releases a hormone called leptin, which is the signal that tells your brain how much stored energy you are carrying, and your gut releases ghrelin, which is the signal that tells your brain to go find food. Those signals land in a cluster of neurons in the hypothalamus, and that cluster adjusts hunger, satiety, and how many calories you burn at rest to hold your body weight near a level it has decided is safe.

When you lose weight, leptin falls, ghrelin rises, and the thermostat starts working against you, and scientists can actually measure that shift happening in real time rather than just theorize about it.

Sumithran and colleagues put people through a ten week very low calorie diet, dropped their weight by about ten percent, and then measured their hormones a full year later. Ghrelin was still elevated above where it started, leptin was still suppressed, and the subjects still reported more hunger than they had before they ever lost a pound, a full year out and still hungrier than their own baseline.

Then there is the Biggest Loser follow up study, where researchers tracked contestants six years after the show ended. Their resting metabolic rate was running roughly 500 calories a day below what you would predict from their body size, and thirteen of the fourteen people they measured had regained weight, with most of them back near where they started.

So when a coach says the person just needs discipline, what they are describing as a character problem is a system that has increased hunger, decreased fullness, and lowered the calorie cost of staying alive, all at the same time, and all without asking permission.

That is the terrain someone at 30% body fat is walking into.

Which is where these drugs come in, and it helps to understand that they are not one thing. There is a family of them, they work on different receptors, and retatrutide sits at the far end of that family.

Semaglutide is a single agonist, meaning it activates one receptor, the GLP-1 receptor. GLP-1 is a hormone your own gut releases after you eat, and it slows how fast your stomach empties, increases insulin release when glucose is high, and acts directly on those hypothalamic neurons to reduce hunger and reduce the pull of food you are not hungry for. In the STEP 1 trial, semaglutide produced about 14.9% body weight reduction over 68 weeks, against 2.4% in the placebo group.

Tirzepatide added a second receptor, GIP, and in SURMOUNT-1 the highest dose produced about 20.9% weight reduction over 72 weeks.

Retatrutide adds a third, hitting GLP-1, GIP, and glucagon, and the glucagon piece is what separates it, because glucagon receptor activation increases energy expenditure and pushes the liver to burn stored fat rather than hold it.

So instead of only turning down intake, it also nudges up output.

In the phase 2 trial published in 2023, participants on the 12 milligram dose lost 24.2% of their body weight at 48 weeks, the 8 milligram group lost 22.8%, and placebo lost 2.1%. In the subgroup that had fat in the liver, liver fat content dropped by more than 80% relative to baseline.

Those are the largest weight reduction numbers anyone has published for a drug in this class, and the honest caveat is that phase 3 trials are still running, retatrutide is not approved, and the long term safety picture is not finished. Anyone telling you it is settled is ahead of the data.

Now back to the question, because knowing what the drug does mechanically does not tell you whether it belongs in a specific person's life.

It's almost like it's embarrassing to admit that you used Retatrucide or a similar drug to see the weight loss progress than you saw. People will lose 60 pounds, rebuild their health markers, get off blood pressure medication, and then quietly leave out the part about the injection, because they have absorbed the idea that the result only counts if it hurt enough on the way there.

What I have watched happen is the opposite of a shortcut. Having Retatrucide and similar drugs as a tool to help people get that initial boost of progress has been probably the most profound influence that helps people make the changes that they want to make for the long term.

Here is why that happens, mechanically rather than motivationally.

When someone is carrying a lot of body fat and the hunger signaling is loud, every attempt at change gets spent on resisting food, and there is nothing left over for the things that actually build a durable body. They are not learning to cook, they are not building a training habit, they are not sleeping better, because all the available effort is going into a fight with their own hypothalamus.

Turn the volume down on that fight and the effort goes somewhere useful. The person eats a normal portion without white knuckling it, so they start noticing what foods actually keep them full, and they have enough energy to train three times a week, and the training makes them stronger, and being stronger makes training something they want to keep doing. The drug only buys them the attention, and what they do with that attention is the part that actually lasts.

And I know a lot of fitness coaches out there, they're going to be black and white about it, and they're going to say if you want the result, you need to have the discipline. I used to be one of those guys too, and I understand where it comes from, because discipline genuinely is the mechanism for a person whose biology is not fighting them very hard.

But the fact of the matter is, is maybe you've been fat before and you pulled yourself out of that place by yourself.

That happened in your body, with your hormone profile, your leptin sensitivity, your history, your food environment, and your particular set of stressors. You don't know what these people have been through, you don't know what their struggles are, you don't know what their limitations are, and you don't know their fucking life.

For you to sit there and pass some type of self-righteous judgment on these people because they're using a tool doesn't make you any better than the Christians who claim to be Christians who are passing judgment on the world.

So the answer for the brother at 30% body fat is that the drug can be a reasonable place to start, and the reason it is only a place to start is that the drug creates a window, and windows close.

Two things determine whether the weight comes back, and both of them are things the drug does not handle for you.

The first is lean tissue, because when you lose weight fast on any protocol, some of what you lose is muscle, and in the imaging subsets of these trials lean tissue has accounted for roughly a quarter of total weight lost. Muscle is where most of your daily glucose gets disposed of and it is a large share of your resting metabolic rate, so losing it lowers the ceiling on what you can eat later without regaining.

That is fixable, and the fix is not complicated. Eat protein in the range of 1.6 to 2.2 grams per kilogram of body weight per day, which for a lot of people means a deliberate protein source at every meal rather than grazing, and lift weights at least two to three times a week with actual progression on the loads.

Appetite suppression makes this harder than it sounds, because when you are only hungry for one small meal a day, protein is the thing that gets crowded out first. Plenty of people on these drugs end up eating 40 or 50 grams a day without realizing it, and that is the setup for losing more muscle than fat percentage-wise.

The second thing is what happens when the drug stops.

In the STEP 1 extension, people who came off semaglutide had regained about two thirds of the weight they lost within a year of stopping. In SURMOUNT-4, participants who lost 20.9% on tirzepatide and then switched to placebo regained roughly 14% of their body weight over the following 52 weeks, while the group that stayed on continued losing.

The regain is not a moral failure either. It is the thermostat coming back online, because the medication was suppressing appetite signaling and when you remove the suppression the signaling returns, and the signaling in a formerly obese person does not reset to the level of someone who was never obese.

Which means the exit plan matters as much as the entry plan.

Practically, that looks like starting at a low dose and titrating slowly rather than chasing the biggest number on the scale, because the gastrointestinal side effects, the nausea and the constipation and the reflux, scale with how fast you climb, and people who feel sick eat even less protein and train even less. Slow titration protects the muscle and protects the habits.

It also looks like using the window on purpose. Build the training habit while eating is easy, learn to cook eight or ten meals you actually like, get your sleep and your step count up, and get your blood work done, because the person who spends twelve months on the drug and changes nothing else is going to regain, and that outcome gets blamed on the drug when it belongs to the plan.

And for some people, staying on a low maintenance dose long term is the reasonable answer, in the same way that someone with high blood pressure stays on their medication. Obesity behaves like a chronic condition with a defended set point, so treating it with something continuous is consistent with how the biology works, not a sign that the person failed at the temporary version.

The thing I would ask the guy who calls this a shortcut is what he thinks the finish line is.

If the finish line is a body that is healthier, stronger, and metabolically better off than it was, then the only question is whether the person got there and whether they can stay. If the finish line is having suffered a specific amount along the way, then the conversation was never about health.

The drug does not build the muscle, it does not learn the recipes, and it does not show up to the gym on a Tuesday when nobody feels like it. It just quiets the part of the brain that has been screaming loud enough to drown all of that out, and then hands the person back the ability to choose.

Judging someone for accepting that help says a lot more about the person judging than the person who finally got to start.