Why are fatty acids more saturated in warm temperatures while they are unsaturated in cold temperatures?

The increment of temperatures favors the oxidation of fatty acids promoting the saturation of them.

Explanation:

When the fatty acids are in an environment of high temperatures they start oxidizing so unsaturations start to spontaneously happen. This process happens in cell membranes as well as in the foods. Saturated fatty acids are more prejudicial to health than unsaturated ones.