GLP-1 in Summer: The Heat Warning Nobody Reads
There is a particular kind of July in Malta where the air itself feels like a threat.
GLP-1 in Summer: The Heat Warning Nobody Reads
There is a particular kind of July in Malta where the air itself feels like a threat. The limestone holds the heat from the previous day, releases it slowly through the night, and by mid-morning the city is already negotiating with the sun. I think about this every summer — how the body, under ordinary circumstances, has its own intelligence about temperature. It sweats. It gets thirsty. It slows down.
What medicine researchers are now documenting, carefully, is that GLP-1 medications — Ozempic, Mounjaro, Wegovy, the drugs that have become shorthand for an entire cultural moment — interfere with exactly that intelligence. They suppress thirst. They blunt the body's early warning system for heat stress. People on these medications may simply not feel the signals that tell them to drink, to rest, to move into shade. By the time the body escalates its alarm, dehydration is already underway.
This is not a reason to stop the medication. The cardiovascular evidence for GLP-1s has become genuinely compelling — a growing body of research links them to reduced stroke and heart attack risk, which is significant for the populations most likely to be prescribed them. But it is a reason to be deliberate in a way the body, on these drugs, will not be for you.
The salsa study came to mind here, because I cannot help connecting threads. Oxford researchers found that eight weeks of salsa classes reduced depressive symptoms and social anxiety in young people — which is its own remarkable finding, rhythm as medicine — but the relevant detail for summer is this: dancing is vigorous physical activity done in the evening, in cooler air, socially, with water nearby. The body is moving but it is also embedded in something social, which means someone notices when you look pale. Structure protects us in ways we don't always credit.
The simpler version is this. If you are taking a GLP-1 medication and you live somewhere that is July right now — Malta, anywhere Mediterranean, anywhere south — your thirst cue is not reliable. It is quieter than it should be. The drug that is helping you in one direction is leaving a gap in another direction, and the gap matters most between June and September.
Drink before you are thirsty. Schedule it, because you cannot feel your way to it. A glass of water before coffee, before any outdoor exposure, before exercise. Not optional. Required.
That is the one thing you can do. Set a reminder. Your body's signal is on mute. You have to remember for it.
