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AAD.org talks about your hair and how to keep it looking good:

While age-wise our hair should be at its healthiest in our 20s, Dr. Draelos noted that some young women fall prey to yo-yo dieting or fad diets at this age - which can wreak havoc on hair. For hair to be healthy, it needs nourishment in the form of protein, vitamins and minerals from the foods we eat. "Hair is a sign of our general overall health," said Dr. Draelos. "When a person has an eating disorder or is omitting certain foods from her diet - such as meat - this can adversely affect the health and appearance of the hair. Hair that is not getting enough nutrition from the foods we eat doesn't grow well and it won't have that radiant, healthy glow."