Thiamine is an essential nutrient that is required for proper metabolism of carbohydrates, fats, and proteins, as well as for proper nervous system function.Thiamine is an essential nutrient that is required for proper metabolism of carbohydrates, fats, and proteins, as well as for proper nervous system function.Thiamine is an essential nutrient that is required for proper metabolism of carbohydrates, fats, and proteins, as well as for proper nervous system function.Thiamine is an essential nutrient that is required for proper metabolism of carbohydrates, fats, and proteins, as well as for proper nervous system function.Thiamine is an essential nutrient that is required for proper metabolism of carbohydrates, fats, and proteins, as well as for proper nervous system function.