i would like to share about his, hopefully its will help you guys.
Don't over think it
Try not to touch processed food. (Take Vitamin B : this will help not only for your hair, but skin and nails are going to be very grateful if you taking it every day. such bananas, soy, fish, eggs, rice most of fruit and vegetables, etc )
The key is protein (eat at least 25-30 grams protein per meal of everyday)
caffeine is poison for hair (Caffeine is not healthy because it makes your body excrete B vitamins faster.Try to eliminate caffeine from your diet and instead try drinking some green iced tea -even its also full of caffeine, but it contains less of it and also works as a awesome antioxidant)
Omega 3 fatty acids will help your hair become thicker by injection collagen restores in your hair
Don't use too much heat
