The edition · Diabetes & Endocrinology
Surgery still beats the injection on the cardiovascular endpoints
A network meta-analysis of 932,000 patients finds bariatric surgery reduces MACE, heart failure and myocardial infarction while GLP-1 receptor agonists move only MACE. Also: insulin sensitivity swings with the menstrual cycle even under closed-loop control, a compounded semaglutide recall for particulate matter, and why the opioid you choose matters in a patient already on a GLP-1.
The edition in brief
A PRISMA network meta-analysis of 43 studies and 932,380 patients with obesity compared bariatric surgery, GLP-1 receptor agonists and control. Against control, surgery reduced major adverse cardiovascular events (HR 0.66, 95% CI 0.60-0.74), heart failure (HR 0.45, 0.38-0.53) and myocardial infarction (HR 0.53, 0.45-0.63). GLP-1 receptor agonists reduced MACE (HR 0.85, 0.77-0.94) with non-significant effects on heart failure and myocardial infarction. Heterogeneity was high, from 66% to 93%, and most contributing data are observational. A decentralised observational study of donated real-world data from 77 menstruating adults with type 1 diabetes using automated insulin delivery covered 380 cycles. Total daily insulin dose and carbohydrate intake peaked in the luteal phase alongside higher mean glucose and reduced time in range. A hierarchical Bayesian model estimated insulin sensitivity 2.6% higher in the early follicular phase (credible interval 0.3 to 5.0) and 2.6% lower in the midluteal phase (-5.2 to -0.1). The pattern held in 84.7% of participants with substantial individual variation. The FDA has listed Class II recalls dated 19 August 2026 of compounded semaglutide multi-dose vials from Apollo Care LLC across multiple strengths, for particulate matter identified as nylon/polyamide and silk or proteinaceous material. Status is ongoing. A new-user cohort of 411,188 adults with type 2 diabetes on GLP-1 receptor agonists who started an opioid found 30-day motility-related gastrointestinal events in 0.51% starting oxycodone, 0.35% hydrocodone and 0.33% tramadol. Oxycodone carried higher risk than hydrocodone (RR 1.48, 95% CI 1.30-1.69) and tramadol (RR 1.55, 1.33-1.79).
Bariatric surgery versus GLP-1 receptor agonists on hard cardiovascular endpoints
Bariatric surgery was associated with reductions in MACE, heart failure and myocardial infarction, while GLP-1 receptor agonists reduced only MACE significantly — grounds for referring surgical candidates earlier, but the comparison is observational and heavily confounded.
The closed loop does not know about the menstrual cycle
Insulin requirements rise and time in range falls in the luteal phase even under automated insulin delivery — ask menstruating patients about it, and look for a monthly rhythm in the download before blaming settings or adherence.
Compounded semaglutide vials recalled for particulate matter
Compounded semaglutide multi-dose vials from one US compounder are under an ongoing Class II recall for particulate matter — a prompt to ask every patient on semaglutide which presentation they are actually injecting.
Reading an ambulatory glucose profile in two minutes
Read a glucose download in this order — wear time, time below range, variability, then time in range — and use the daily overlay, not the summary, to decide which single change to make.
If your patient is on a GLP-1 and needs an opioid, oxycodone is the wrong one
In patients on a GLP-1 receptor agonist, starting oxycodone carried about a 50% higher 30-day risk of severe constipation or bowel obstruction than hydrocodone or tramadol — pick a different opioid where you can, and co-prescribe a laxative.
Read the rest in the app
You have read your two free briefings this month. The app carries all 27 specialties, every morning, free — and this one is waiting in it.

Scan to keep reading on your phone. No account needed to start.
Tomorrow morning, before your first patient
One edition a day for diabetes & endocrinology, written by the desk, every claim tied to its paper. Six minutes.
Get the app — free