Given that the formula is always the same, yes, according to Sara Risch, a food chemist and member of the Institute of Food Technologists. "While packaging and food companies work to prevent any interactions, they can occur," she says. For example, the polymer that lines aluminum cans might absorb small amounts of soluble flavor from the soda. Conversely, acetaldehyde in plastic bottles might migrate into the soda. The FDA regulates this kind of potential chemical contact, but even minute, allowable amounts could alter flavor.