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Hair Health and Weight Loss Diets

Weight loss, especially rapid weight loss from a restrictive diet, can cause major hair loss. "Master hairdressers," Gerbstadt says, "know without being told when their clients are dieting -- just from the changes in the hair."

"Women on a very strict calorie-deprived diet will lose weight very quickly. But it's hard to ensure they get the nutrients they need," McMichael says. Weight loss can also stress the body, which also contributes to hair loss. "Even if you lose weight very slowly on a doctor-approved program, you can still have associated hair loss."

It's common to shed hair after losing15 pounds or more. Be patient. If you're healthy, your hair will come back after weight stabilizes, McMichael says.