University College London and Loughborough University researchers analyzed 13,799 negative posts on X about the five top-grossing fitness apps worldwide. The study found apps often generate unrealistic daily calorie targets that users describe as unattainable. One user wrote, “So my fitness pal says if I want to reach my goal weight I need to consume −700 (negative 700) calories a day.” Another warned, “My Fitness Pal should be used for tracking calories ONLY. If you allow it to prescribe your calories you’ll end up with a deficit that’s unachievable, unsustainable and very unhealthy.” Users reported shame when missing streak milestones and confusion over exercise calories. Many abandoned healthy behaviors entirely when faced with impossible algorithmic goals. The research suggests current app designs prioritize engagement over sustainable health outcomes. (Story URL)