If your hair is dull, it’s because it’s unable to properly reflect light. When the hair is healthy, it lies flat, and, when light hits it, the light bounces off the cuticle, making it supershiny. But if you’re not getting enough protein in your diet, the cuticle will gnarl and lift. Overexposing the hair to stripping agents, like bleach, can also be a cause.
How to correct it: Stock up on protein-rich foods, which allow the cuticle to grow and lie properly
Foods to include: lean meats like poultry and salmon, cleansing vegetables like algae and wheatgrass
Foods to avoid: complex carbohydrates, junk food
Thicken hair with oysters and nuts
Hair loss has been linked to a zinc deficiency, so fill up on foods high in the mineral to keep your tresses full. Besides being known as a classic aphrodisiac (thanks to their resemblance to a certain female body part), oysters contain more zinc than almost any other food. Not a seafood fan? Other good sources include red meat, peanuts, cashews, and pumpkin seeds. For an easy zinc fix, eat raw oysters on ice with some lemon juice or chili sauce. Or toss roasted pumpkin seeds or peanuts in your next salad.