Investment from Hong Kong, Macau and Taiwan mainly refers to the investment activities carried out by companies from Hong Kong, Macau and Taiwan in other regions. Based on what I know, here are some food sectors where there may be investment from Hong Kong, Macau and Taiwan:

1. Catering Chain: Catering companies from Hong Kong, Macau and Taiwan may open chain stores in other regions to promote their catering brands.

2. Food processing: Companies from Hong Kong, Macau and Taiwan may set up food processing business in other regions, such as processing cookies, candies, seasonings, etc.

3. Hotel and tourism: It is relatively common for Hong Kong, Macau and Taiwan enterprises to invest in hotel and tourism in other regions. For example, setting up hotels or resorts in overseas tourist destinations.

4. Food import and trade: Businesses in Hong Kong, Macau and Taiwan may import and trade various types of foodstuffs for sale in other regions.

It is important to note that specific investment projects and food categories will vary depending on the type of business and strategic choices. There are also other food sectors where Hong Kong, Macau and Taiwan investments may exist, and the specifics may vary depending on the time and location. If you have a specific time and place in mind, please provide more details so that a more accurate answer can be given.