Which type of fat has hydrogen atoms on the same side of the double bond?

Cis fats are characterized by the arrangement of hydrogen atoms on the same side of a double bond in the fatty acid chain. This configuration creates a bend or kink in the molecular structure, affecting how the fats behave at room temperature. Unlike trans fats, which have hydrogen atoms on opposite sides of the double bond and tend to be straight, cis fats remain more fluid and are typically found in natural oils and fats.

Saturated fats, on the other hand, contain no double bonds between carbon atoms and are typically solid at room temperature, which differentiates them from unsaturated fats. Unsaturated fats can include both cis and trans configurations; however, the term "unsaturated fats" does not specifically denote the same-side positioning of hydrogen atoms that defines cis fats. Therefore, cis fats are the correct choice due to their specific molecular arrangement.