That's because a lot of the "traditional way" methods are pseudoscience at best, outright quackery that's going to send you into serious malnutrition issues or eating disorders at worst. Every two or three months you see a new diet fad pushed through the yellow press rags, and none of it anywhere near being considered scientifically valid - usually it's some VIP shilling some crap story to explain how they lost weight, of course without telling the people that they have the time for training and the money to pay for proper food, 1:1 training and bloodwork analysis.