Diet culture keeps rebranding the same ideas, from SlimFast and Weight Watchers to keto, carnivore, and fasting—new names, same results. While some diets can have short-term benefits for specific people, most fail long term because weight loss comes down to a calorie deficit, not food rules or extremes. We break down how influencers and celebrities profit off fear-based food messaging with little evidence to back it up. The real answer? Eat mostly whole, nutrient-dense foods, get enough protein and fiber, leave room for pleasure, and stop chasing diet trends.