Hair density, often confused with hair thickness, refers to the number of individual hair strands present in a specific area of the scalp. Conversely, hair thickness relates to the width of a single hair strand. Thick hair is visibly wider as a single strand, feels coarser to the touch, and typically measures at least 0.08 millimeters in thickness. In contrast, thin hair can be challenging to distinguish as individual strands, feels soft and smooth, and generally measures no more than 0.05 millimeters in width.
While neither hair type is inherently “healthier” than the other, many individuals favor thicker hair due to its potential benefits. Thick hair can provide better protection from sun damage, often appears fuller with increased volume, and can conceal the scalp, including any bald patches.
What Factors Influence Thick Hair?
According to Michelle Henry, MD, a board-certified dermatologist with Harvard training, the primary determinant of hair thickness is genetics. Specifically, genetic factors influence the number and size of hair follicles on the scalp, ultimately shaping hair thickness. Therefore, in the absence of specific medical conditions or illnesses, your hair thickness is likely to resemble that of your parents, as noted by Angela Lamb, MD, a dermatologist at Mount Sinai in New York City.
In addition to genetic factors, several external and individual variables can marginally impact hair thickness. These include hormonal fluctuations, age, and overall health, as explained by Dr. Henry.
Dietary Choices and Hair Thickness
There is a common misconception that dietary changes can transform thin hair into thicker locks. However, experts assert that this belief stems from misunderstandings about nutritional deficiencies and their effects on hair health. Shari Lipner, MD, an associate professor of clinical dermatology at the Weill Cornell Medical Center, clarifies that while maintaining a well-balanced diet is crucial, there is no evidence to suggest that dietary alterations alone can significantly increase hair thickness.
Instead, deficiencies in certain vitamins and minerals, such as biotin, zinc, iron, and vitamin D, can lead to hair loss and thinning. To support healthy hair, it is essential to include specific foods in your diet, including whole grains, vibrant vegetables, nuts, and legumes, according to Dr. Lamb.
Tips for Achieving Thicker Hair
Beyond dietary choices, there are several strategies to enhance hair thickness, strength, and protection. Dr. Henry recommends minimizing the use of excessive heat styling and harsh chemical treatments that can damage hair follicles. She advises selecting gentle hair care products tailored to your hair type and avoiding overwashing, which can strip away natural oils.
Dr. Lamb suggests that one of the most effective ways to strengthen thinning hair, whether due to poor health or excessive styling, is to use a protein-based conditioner. Additionally, leave-in thickening and volumizing products, such as dry shampoo, mousses, serums, coconut oil, gels, and sprays, can prove beneficial.
Some individuals have found success with sea salt spray, a product known for creating beachy waves and texture in the hair.
In cases where more substantial intervention is necessary, medication options may be recommended, either taken orally or applied topically. Board-certified dermatologists can provide guidance and prescribe medications to stimulate hair growth and increase hair density. These medications may include topical and oral minoxidil, oral spironolactone, and oral finasteride, according to Dr. Lipner.
In conclusion, understanding the distinction between hair density and thickness is essential for effective hair care. While genetics primarily determine hair thickness, maintaining a balanced diet and adopting suitable hair care practices can contribute to the overall health and appearance of your hair. In cases of hair thinning or loss, consulting a dermatologist for personalized recommendations and potential medical treatments may be advisable.
