UK health officials advise 1.5 million people on weight-loss drugs to pause treatment during severe flu season due to illness risks.

A surge in flu cases, labeled "super flu," is affecting the UK in January 2026, prompting health officials to advise about 1.5 million people using weight loss injections like Mounjaro or Wegovy to consider pausing treatment during illness. While medication side effects such as nausea and fatigue can mimic flu symptoms, they result from metabolic changes, not viral infection. The flu primarily impacts the respiratory system, and reduced appetite during illness may increase risks of malnutrition and dehydration, making temporary dose delays advisable. Experts recommend consulting healthcare providers before adjusting treatment, staying hydrated, and using over-the-counter remedies for symptom relief.