Running marathons on GLP-1 weight-loss drugs brings tough side-effects

As GLP-1 weight-loss drugs grow popular, some endurance runners are struggling with side-effects. One experienced marathoner felt nauseous and could barely keep down energy gels during a half marathon after her first 2.5mg dose of tirzepatide. Use of GLP-1s for weight loss has risen from 3% to 11% in two years, and dietitians report working with several marathoners on them.