Your fingernails may hold hidden clues about diet and health risks

A recent study from Fulda University of Applied Sciences has shown that fingernail mineral levels can reveal key details about diet, lifestyle, and health. Published in the journal BioFactors, the research analysed samples from 1,248 participants between 2023 and 2025, linking nail abnormalities to specific mineral imbalances.

The findings suggest that nails, which grow slowly and store minerals over months, could serve as a non-invasive tool for assessing long-term nutritional habits.

The study used advanced technology called inductively coupled plasma mass spectrometry (ICP-MS) to measure mineral concentrations in fingernails. Researchers discovered strong connections between certain mineral pairs and visible nail changes. For example, low zinc combined with high copper (r = -0.72) was tied to white spots, while imbalanced magnesium and calcium (r = 0.65) correlated with longitudinal ridges.

Diet played a clear role in mineral levels. Omnivores showed higher selenium concentrations than vegetarians or vegans. Participants taking selenium supplements had, on average, 21% more selenium in their nails. The study also noted that people with thyroid conditions exhibited elevated selenium levels.

Looking ahead, the team plans to expand the research by combining fingernail mineral analysis with Gemini-assisted image recognition. This approach aims to improve early detection of micronutrient deficiencies and related health risks.

The Fulda NutriNAIL study provides evidence that fingernail analysis can reflect dietary patterns and mineral imbalances. By identifying links between specific minerals and nail abnormalities, the research opens possibilities for non-invasive health monitoring. Future work will explore Gemini integration to refine deficiency detection methods.