Your nails are brittle
If your nails break more often than usual, this should be a concern. They can be brittle for a range of reasons, but the two most common ones are collagen and calcium deficiencies. As you know, collagen is a protein that supports your skin, skeleton and connective tissue. It’s important to keep it healthy with foods like soy, berries, citrus and leafy greens. Calcium is a mineral that maintains your bone health. So, if you’re lacking them, your nails will reveal this issue.