@fatdadlosingweight's 100-pound Wegovy claim, fact-checked

What did @fatdadlosingweight actually say?

He's starting his first week at the 2.4 mg Wegovy maintenance dose, self-injecting into his abdomen "two fingers from my belly button." He mentions he's heard the stomach causes more side effects and floats switching to his thigh if problems come up. He also references the pen clicking and turning yellow as confirmation the dose delivered. That's the sum of the clinical content here.

To his credit, this isn't someone claiming Wegovy will cure anything. It's a guy documenting a lifestyle change for his kids, aiming to drop 100 pounds in a year. The injection technique walkthrough is where things get medically interesting, and where a few things need correcting.

Does the science back this up?

Partially. The approved injection sites for semaglutide are abdomen, upper arm, and thigh, so he's not wrong to consider all three. But the claim that the stomach causes "more side effects" is not well supported by the evidence.

The STEP 1 trial (Wilding et al., 2021, NEJM) and subsequent pharmacokinetic analyses did not identify injection site as a meaningful driver of GI side effects like nausea and vomiting. Those side effects are driven by the drug's mechanism, specifically GLP-1 receptor activation in the gut and brainstem, not by where the needle goes. A 2022 review in Diabetes, Obesity and Metabolism (Blundell et al.) confirmed that absorption rates differ modestly by site, with abdominal injection producing slightly faster absorption than thigh, but this does not translate to a clinically significant increase in nausea for most people. The stomach-equals-more-side-effects idea is a piece of patient-community folklore that has outrun the data.

What did they get wrong (or right)?

Let's give him credit first. Rotating injection sites is actually good practice. The FDA prescribing information for Wegovy recommends rotating sites to reduce lipohypertrophy risk, so his instinct to try the thigh isn't wrong, just based on a shaky reason.

What he got wrong: the idea that the abdomen is uniquely problematic for side effects. That belief is widespread on TikTok and Reddit GLP-1 communities, but it does not hold up clinically. If he switches to his thigh expecting fewer nausea episodes and they persist, which is likely during dose escalation, he may incorrectly conclude the thigh isn't working either.

The pen technique description, "it should turn yellow," is consistent with how Novo Nordisk's autoinjector confirms dose delivery. That part is accurate. However, he says he "tickled it off," which sounds like a very brief injection hold. Novo Nordisk recommends holding the pen against the skin for at least six seconds after the click to ensure full dose delivery. A rushed injection can result in partial dosing.

What should you actually know?

A few things worth knowing if you're starting or already on semaglutide. First, GI side effects during dose escalation, and 2.4 mg is the top maintenance dose, are common regardless of injection site. The STEP trials reported nausea in roughly 44 percent of patients at the highest dose. That's the drug working on your gut motility and appetite centers, not a problem with your technique.

Second, injection site rotation matters, but for skin health reasons, not side effect management. Rotating between abdomen, thigh, and upper arm prevents localized fat buildup that can actually impair absorption over time.

Third, the six-second hold after the click is not optional. Studies on autoinjector adherence have shown incomplete delivery is more common than patients realize when the hold step is skipped. If you're paying out of pocket for Wegovy, partial dosing is money wasted.

Finally, a 100-pound weight loss goal in 12 months is ambitious. The STEP 1 data showed average weight loss of around 15 percent of body weight over 68 weeks. At 300 pounds, 15 percent is 45 pounds. Hitting 100 pounds in 12 months would require outcomes well above the clinical trial average, and would likely require significant dietary and behavioral changes alongside the medication, which he seems aware of.