Why I still feel cold even if I eat one banana almost everyday?

It is said that banana contains potassium and potassium keeps your body warm in winter. I eat one banana almost everyday yet i still feel cold than the average human. i wear jackets, sweaters, isothermal clothes, gloves, etc in order to go out whilst others i see they don't even wear a jacket yet.

and in my home i need to open up Air Condition often for warm air.
Why I still feel cold even if I eat one banana almost everyday?
Post Opinion