The idea of opening a slimming restaurant is good, but any investment is risky, just depending on the risk. In order to reduce business risks, investors need to do a good job in market research in the early stage, understand the base of consumers, as well as product positioning and so on.
If you have no experience in catering business, you can go to a professional catering training institution to study. After systematic training, you can also take fewer detours in opening a store.