the promotion of "small portion", "half portion" and "small portion" and "half portion" may increase the time, manpower and material costs of catering units, but it will also bring the following benefits:

1. Reduce food waste: By promoting "small portion" and "half portion", diners can reduce the time when ordering. Because the portions of dishes are small, consumers can choose their own food intake more reasonably and reduce food waste.

2. improve service quality: catering units need to strictly control the quantity and quality of dishes when promoting measures such as "small dishes" and "half dishes". This can not only reduce waste, but also improve service quality and meet consumers' needs for health and quality.

3. increase consumers' choice: the promotion of "small portions" and "half portions" can give consumers more choice, and they can choose different portions of dishes according to their own tastes and dietary needs. This can also drive the competition in the catering market and promote more innovation and improvement.

Although the promotion of "small portions" and "half portions" may increase the cost of time, manpower and material resources, in the long run, it can promote the sustainable development of the catering industry, reduce waste, and improve service quality and consumers' choice. Therefore, it is worthwhile to promote these measures.