Everyone Noticed the Device on Arda Güler’s Arm Against Monaco — Here’s What It Really Does
Real Madrid’s convincing win over Monaco wasn’t the only thing that caught fans’ attention. Viewers quickly spotted a small, round device attached to Arda Güler’s arm, sparking intense speculation online.
So what was it?
The device is a glucose monitor, a tool designed to track blood glucose levels in real time. While these devices are commonly associated with diabetes management, there is no indication whatsoever that the Turkish midfielder has diabetes.
Instead, this is part of a growing trend among elite athletes using advanced technology to maximize performance.
Why Would a Footballer Wear a Glucose Monitor?
According to nutritionist Guillermo Gómez from Madrid’s Cemtro Clinic, the device helps athletes understand how their bodies respond to training, rest, and food.
“It allows us to see how glucose reacts to exercise, recovery, and nutrition,” Gómez explained to CuídatePlus.
He offered a clear example:
“Some athletes follow low-carbohydrate diets, but their sport demands maximum intensity. Glucose monitoring helps them identify the exact moment when their body needs carbohydrates.”
How It Helps on the Pitch
In high-intensity sports like football — where tempo, sprints, and recovery constantly change — glucose levels can fluctuate rapidly. The monitor provides valuable insights, such as:
• when the body starts running low on energy
• sudden drops in glucose that affect performance
• the impact of heat, hydration, and training intensity
“This allows nutrition to be adjusted very precisely — what to eat, how much, and when,” Gómez emphasizes. “It makes fueling the body far more personalized.”
Does It Actually Improve Performance?
Experts are clear: glucose monitors are not magic tools.
There is currently no strong scientific evidence proving they directly improve athletic performance in healthy athletes. However, many elite players report positive experiences when using them as part of a broader performance strategy.
“The fundamentals remain the same,” Gómez concludes.
“Proper training, balanced nutrition, and adequate rest. Glucose monitors can be an extra tool — but they are not essential for athletes without medical conditions.”
