If you apply for a food patent, you can only go to China National Intellectual Property Administration. You only need to describe in detail how the patent is realized in the specification and apply for a patent for invention. Its cost is about: application fee 900+ printing fee 50+ substantive examination fee 2500. If authorized, there will be other expenses such as annual fees in the future. If you don't know much about patent affairs and don't want to spend time studying, you can find a patent agency to represent your patent affairs, and the agency fee must be more than 5000 yuan.
However, after applying for a patent, if you want to sell it, you still need to go to the Food Inspection and Quarantine Bureau for inspection.