Deficiencies in nutrients like omega fatty acids, zinc, vitamin D, and vitamin E are linked to different types of hair loss (10). Hence, you can figure out if your eyebrows are thinning due to any of the above deficiencies and avail treatment accordingly.
Foods rich in these nutrients include fatty fish, eggs, walnuts, tofu, shellfish, legumes, nuts, dairy, cheese, spinach, and avocado. Talk to your doctor if you plan to take additional supplements for these nutrients.