Useful, but not applicable to any system. Growing children can't just eat this kind of food with single nutrition, which will affect their development. This method is more suitable for young and middle-aged people and the elderly, because if nutrition can't keep up, it may lead to long-term shock, syncope, physical exhaustion and other symptoms. Physical fitness and age directly affect your slimming method, but it is suggested that you should lose weight healthily, that is, exercise. Don't eat high-fat food often, just control it properly, because losing weight is not worth it! ! !