Around 80% of men and nearly half of women contend with noticeable hair loss at one time or another. It may be hereditary, or may result from an autoimmune condition (alopecia areata), use of harsh beauty products, too much testosterone, thyroid disease, or chemotherapy.

But hair loss can also be caused by nutritional imbalances and stress — which are often related. Stress interferes with good food choices, and a nutritional deficiency stresses your body.

You know our stress-relief formula: Have a posse and a purpose, get daily physical activity, establish a healthy sleep routine, and eliminate stress-producing, highly processed foods and added sugars from your diet.

Also, make sure your stress and hair loss aren't caused by deficiencies in biotin, iron, zinc, or protein.

One study found that 38% of women with hair loss were biotin deficient. You can get your daily adequate intake of 30 mg of biotin by eating canned pink salmon, almonds, sweet potatoes, and spinach, or by taking a multivitamin.

Iron deficiency can also trigger hair loss. But before you take an iron supplement, talk to your doctor. Otherwise, go ahead and eat iron-rich tofu, spinach, broccoli, and peas as well a vitamin-C-rich tomatoes and strawberries to boost iron absorption.

As for zinc ... It's in nuts, seeds, legumes, chicken, and turkey. As a supplement, stick with the recommended daily allowance of 11 mg for men and 8 mg for women. Too much can weaken your immune system.