I want to know the answer to the following question:
Who asked her to change her mind about the soft drink deal due to the nature of the product?
All the background I'm provided with is that "The Center for Science in the Public Interest (CSPINET) wrote Beyoncé an open letter asking her to reconsider the deal because of the unhealthiness of the product and to donate the proceeds to a medical organisation.". Is that enough to answer the question?
Answer: yes