Is it safe to store macaroni salad in aluminum overnight?

It is generally not recommended to store macaroni salad in aluminum overnight.

Aluminum is a reactive metal that can react with acidic foods, such as macaroni salad, and cause the food to become tainted. This can lead to changes in the taste, texture, and color of the food, and can also pose a health risk.

In addition, aluminum cookware can leach aluminum into food, especially when the food is acidic or cooked for a long time. Aluminum has been linked to several health problems, including Alzheimer's disease and kidney damage.

For these reasons, it is best to store macaroni salad in a non-reactive container, such as glass or plastic, overnight.