Which of the following is not a source of protein?

Protein is an essential macronutrient that plays a critical role in various bodily functions, including muscle repair, immune response, and hormone production. Different food sources provide protein, but they vary in quantity and quality.

Beans, poultry, and milk are all recognized as significant sources of protein. Beans, for instance, are leguminous plants that not only offer protein but also include fiber and essential nutrients. Poultry, such as chicken or turkey, is known for its high protein content and is often consumed for muscle building and maintenance. Milk is also a rich source of protein, particularly casein and whey, which are crucial for muscle recovery and growth.

Vegetables, while being an important part of a well-rounded diet providing vitamins, minerals, and fiber, typically contain lower amounts of protein compared to the other options listed. While some vegetables contain small amounts of protein, they do not serve as a primary source of protein. Therefore, when considering the options provided, vegetables are not categorized as significant protein sources, making them the correct answer for which option does not typically provide protein.