Keep Your Neck and Wrists Covered. Primary blood vessels come close to the surface of the skin in the neck and wrists. If you keep these areas protected from the air, less heat will escape. Tight clothing restricts the blood flow into the extremities. Smoking, of course is known to clog arteries.
Drafts affect people sensitive to cold much worse than others.
Dolomite or elemental calcium can clog blood vessels. Organic calcium like bone meal or oyster shell does not do this. Margarine, contrary to popular belief, cannot be absorbed or digested easily into the body. As a result it tends to leave a residue in the arteries which can cause arteriosclerosis, resulting in poor circulation. Use Exercise or Physical Therapy.