Which type of fat is mostly found in animals and is solid at room temperature due to a high hydrogen-to-carbon ratio?

• A. Unsaturated Fats
• B. Saturated Fats
• C. Trans Fats
• D. Polyunsaturated Fats

Answer: (B)

Fats differ in how saturated their fatty acid chains are, which determines their melting point. Fats found mostly in animals are solid at room temperature because their fatty acids are saturated: every carbon is bound to as many hydrogens as possible, so there are no double bonds. Those straight chains pack tightly, raising the melting point so the fat stays solid at room temperature. In contrast, unsaturated fats have one or more double bonds that create kinks, preventing tight packing and making them liquid at room temperature. Polyunsaturated fats have even more double bonds, lowering the melting point further. Trans fats are unsaturated fats that have been hydrogenated to be more solid, but they aren’t the typical animal fats described here.