Ask a few people about how regulary they drink sodas and other type of drinks.
Make a little experiment with sodas, water,
juice, milk, and other type people drink, then put a nail, plant, coin or other different thing that might have a reacton when is
introduced to the beberage, this way we can see which of the drinks
affected the object most to see which of them is wors for the organs, specialy for your kidneys so we might have a little idea of what happens when we consume those drinks.
What might happen is that the objects introduced to the soda is going to be the most affected because sodas are not healthy for the kidneys of other different parts of your body.