Internal phlegm

Without knowing any details about the person in question only a general answer can be offered. Generally speaking anyone, really, but anyone with aspects of dampness/phlegm in Chinese Medicine terms needs to move towards any number of the anti-inflammatory style diets available (mediterranean, etc.) - also restricting fried foods, alcohol, dairy, etc.

The best person to ask would be the practitioner who recommended nei xiao luo li wan as they would be most familiar with your individual diagnosis in Chinese Medicine terms (not by symptoms) and be able to best tailor the dietary/lifestyle recommendations.