Best Foods for Strong Hair and Nails: Nourish from WithinHealthy, shiny hair and strong nails are more than just aesthetic goals—they’re indicators of your overall well-being. Factors like stress, hormonal changes, and nutrient deficiencies can lead to brittle nails or thinning hair. Fortunately, a nutrient-rich diet can strengthen keratin, the protein that forms hair and nails, and promote resi..