5 tips to get thicker hair and common causes of hair loss or thinning Erin Heger,Debra JalimanDec 23, 2020, 02:22 IST To get thick, healthy hair it's important to eat a diet rich in protein, healthy fats, and iron.Alexander Spatari/Getty Images To get thicker hair, eat a healthy diet with omega-3 fatty acids, B vitamins, iron, and vitamin D. For thicker hair, it's important to use a sulfate-free shampoo and to stop using heat styling products like flat irons or curling irons. Thin hair can be the result of genetics, nutritional deficiencies, stress, or damaged hair. There is no proven way ...