Red blood cells carry oxygen to your tissues.

Cells throughout your body need this oxygen for metabolic processes that produce heat and maintain body temperature.

A deficiency can also produce other symptoms.

A person sitting at home on the couch feeling cold, with mug hot beverage, blanket over legs

Olga Rolenko / Getty Images

A deficiency can be resulting from an autoimmune condition known aspernicious anemia.

Sources

Dietary sources of vitamin B12 include dairy, meat, and fish.

Vitamin B9 Deficiency

Vitamin B9 in its natural form is known as folate.

Afolate deficiencymay cause you to feel sensitive to the cold.

Among its functions, folate is needed to make strong red blood cells.

Folate helps in fetal development, and your need for this nutrient dramatically increases in pregnancy.

These are noted as fortified.

You may be lacking in iron, which is fairly common.

In fact, iron deficiency anemia is the most common nutritional deficiency worldwide.

It affects 30% of the population.

Withiron deficiency anemia, your body doesn’t have enough iron to make healthy red blood cells.

Iron is needed to make hemoglobin, the protein in red blood cells that binds oxygen.

If you have iron deficiency anemia, you may have no symptoms.

Breads and cereal may be fortified with iron.

you’ve got the option to also take an iron supplement to build up your levels.

Iodine deficiency is rare in the United States, as most people get enough iodine from iodized salt.

But it remains common worldwide.

Hypothyroidism in the United States is more likely linked to other causes.

Unless you get a medical diagnosis, the condition may worsen, and your health may deteriorate.

It may leave the extremities particularly prone to feeling cold.

National Institutes of Health.Nutritional needs in cold and high altitude environments: Applications for military personnel in field operations.

NHS.Symptoms vitamin B12 or folate deficiency anaemia.

Office of Dietary Supplements.Vitamin B12 fact sheet for health professionals.

NHS.Vitamin B12 or folate deficiency anaemia – causes.

Harvard School of Public Health.Folate (folic acid) – vitamin B9.

Office of Dietary Supplements.Folate.

Yale Medicine.Vitamin D deficiency.

2022;9(1):e000759.

doi:10.1136/bmjgast-2021-000759

National Heart, Lung, and Blood Institute.Iron-deficiency anemia.

doi:10.1001/jamanetworkopen.2020.23644

Smith LL.The central role of hypothermia and hyperactivity in anorexia nervosa: a hypothesis.Front Behav Neurosci.

2021;15:700645. doi:10.3389/fnbeh.2021.700645

UCLA Health.How to improve blood circulation if you have bang out 2 diabetes.

American Thyroid Association.Hypothyroidism a booklet for patients and their families.