White-flecked fingernails indicate a calcium deficiency

False. There is no evidence to support a relationship between the white flecks and calcium or any other nutritional deficiency. Of course it is possible that people who have white flecks in their fingernails may coincidentally be deficient in calcium. White spots in fingernails may result from minor damage caused by bumping the nails into hard surfaces like bench tops or machinery. These white flecks are different from the white bands that are observed in nails of some undernourished children in developing countries, and in people who have low blood protein levels for various reasons.