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High consumption of animal fats (such as those found in fast food), vitamin A or rapid weight loss reduces the amino acids and vitamin assimulation needed for hair growth. Poor nutrition, limiting food intake, and liquid protein diets can cause hair loss. Deficiencies in biotin, iron, protein and zinc are particulary damaging to healthy hair growth. Toxicity of vitamins and minerals can also cause hair loss.
Extracted from "An educated look into the causes of Hair Loss" by Nioxin Research Laboratories Inc.
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