Doctors warn of a hidden GLP-1 danger that doesn’t show up on a normal blood sugar test

by Adrienne ErinSeptember 2, 2026

GLP-1  drugs like Ozempic, Wegovy, and Mounjaro are best known for common, manageable side effects — nausea, diarrhea, occasional vomiting. A new editorial and a growing set of real case reports point to something more serious happening in a smaller group of people, and it’s a complication that can hide in plain sight because the usual warning sign — high blood sugar — often isn’t there at all. 

Key Takeaways

• A new editorial in the journal Diabetology International argues that the most serious harms from GLP-1 drugs increasingly stem from inappropriate use — off-label cosmetic use, unsupervised dosing, and medication obtained outside normal medical channels — not just the well-known standard side effects.
• Multiple case reports from Japan, the UK, and elsewhere describe a dangerous complication called euglycemic or starvation ketoacidosis, where dangerous acid and ketone levels build up in the blood even though blood sugar looks normal or only mildly elevated.
• In Japan, three young, non-diabetic women were hospitalized with this condition after obtaining tirzepatide off-label for cosmetic weight loss, often without ongoing medical supervision.
• This complication is considered rare, but case reports of it have been increasing as more people use these drugs, including through online prescriptions and aesthetic clinics outside standard medical oversight.