What cannot be patented? a discovery, scientific theory or mathematical method, an aesthetic creation, a scheme, rule or method for performing a mental act, playing a game or doing business, or a computer program, a presentation of information,
The short answer is yes, in the US a new use for an existing product that is ``new, useful, and non-obvious'' (as the patent law requires/defines) may be patented. That is, a new use may not be precluded from being patented simply because it is a new use for an existing product.
In the United States, there are three types of patents, all governed by the U.S. Patent and Trademark Office (USPTO): utility, design, and plant. Chemical patents can protect chemical compounds, compositions of matter, methods of making the chemical compound or composition, and methods of use.
Yes, You Can Patent Food Products! Companies in the food and beverage industry might overlook significant advantages by not patenting their innovations. While there's a common belief that “recipes” cannot be patented, unique formulations and other aspects of food and beverage products often can be.