Found in low-fat dairy products, chicken, and eggs.
"People who have inadequate amounts of high-quality protein in their diets may experience brittle and weak hair," says Masor. Why? Because protein make up the building blocks of hair (it makes up the inside of every single strand), so if you're low on this bad boy in your diet, your hair is going to be, too. Then, it's going to seem finer and not as full.