My part question: How does the product or service transform adverse social or environmental
impact into sustainable value?

What kinds of yogurt will generate adverse social or environmental impact? From two perspectives to say, one is value-destroyed to sustainable value opportunity, another is value-missed to sustainable value.
(Use value mapping tool) picture below

Find points to explain for Value destroyed and missed from the whole yogurt, not activia. The value opportunity will be how activia do to avoid these kinds of problems ( explain how activia actually do)