The potential attraction is clear. Reducing excess weight can improve the power-to-weight ratio, ease pressure on joints and support heat tolerance-factors that matter across a long football season.
GLP-1 drugs may also appeal to athletes competing under strict weight demands in other sports. But there is no evidence that their use has become a confirmed trend among footballers. The report says interest has grown among athletes, coaches, agents and performance staff, increasing pressure on clubs to understand the medical implications.
The main concern is what happens to lean tissue and training capacity.
The report cites studies suggesting that 15% to 40% of weight lost through these medicines can come from muscle and other lean tissue when nutrition and strength training are not properly managed. For footballers, that could undermine acceleration, strength, recovery and resilience across congested schedules.
Side effects create another problem. Nausea, vomiting and diarrhoea can disrupt training, while reduced appetite may make it harder to consume the energy and protein required for intense workloads. More serious complications, including pancreatitis, kidney injury and intestinal paralysis, have also been highlighted.
WADA monitoring does not mean automatic suspicion. It is a way to track scientific evidence, adverse events and usage patterns before deciding whether restrictions are justified.
The report says a substance must meet at least two of three criteria for prohibition: the potential to enhance performance, a risk to athlete health, or a conflict with the spirit of sport. That leaves GLP-1 medicines in a grey area. Weight loss may help some physical parameters, but medical use, performance enhancement and player welfare are not the same issue.
For now, club doctors and governing bodies face observation rather than prohibition. The next major storyline will be whether evidence around muscle loss, recovery and competitive advantage pushes GLP-1 drugs from WADA’s monitoring list towards formal guidance or regulation.