Why is milk packaged in opaque containers?

Milk is packaged in opaque containers primarily to avoid the UV destruction of riboflavin, also known as vitamin B2. Riboflavin is sensitive to light and can degrade when exposed to ultraviolet rays, leading to a reduction in nutritional quality. By using opaque packaging, manufacturers can effectively protect riboflavin and retain the milk’s nutritional content for a longer period.

The packaging also plays a crucial role in maintaining the overall quality of the milk by limiting exposure to light, which can cause other undesirable changes in flavor and color. This practice ensures that consumers receive a product that is not only safe to consume but also retains its intended nutrient profile.