Oh the memories! It could be a zinc deficiency. For years I always had cold hands and feet. Even during the hottest summer I would have to wear an undershirt and a jacket. Then I read that it might indicate a zinc deficiency and to take 50 mg of zinc a day. I've been doing that for three years now and I'm no longer cold all of the time. In fact, I just started to wear a llight jacket in the mornings and evenings. Give it a try. I hope it helps.