Light diet, for a person with stomach trouble, can really slowly raise stomach trouble, but whether it can be preserved is really a mystery.
It really doesn't matter to a fat man. Anyway, a light diet can make your appetite smaller, and you can also change your appetite to make it smaller and smaller, so that you won't become so fat again.
If a thin man eats a light diet, his appetite will drop even more, which will make him feel particularly unattractive when eating. After all, he is used to eating spicy food at ordinary times, and suddenly changing to light food will make him anorexia. Plus the diet is too light and not greasy, which is really bad for thin people. He is already very thin. If he doesn't eat something nutritious, he will only get thinner.
People are getting thinner and thinner. What about health care? Health preservation can only be considered as health preservation if you are in good physical condition. What's the use of keeping in good health if you are skinny?
So I think a light diet may not be able to maintain health, which varies from person to person.