Weak, brittle nails may be a sign of malnutrition, especially in terms of inadequate protein levels. You can boost your protein intake the healthy way with high-quality, low-fat options like skinless poultry, egg whites, beans and oily fish (like salmon). Be advised that extreme nail weakness could indicate thyroid disease, so be sure to follow up with your doctor if you notice that your nails are excessively brittle.*

Low levels of biotin could also be to blame for brittle nails. For an easy fix just supplement 300 mcg of biotin per day to increase your nail thickness.

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*http://www.huffingtonpost.com/2013/01/24/brittle-nail-causes_n_2540959.html
Photo | “Toe nails” | Filip Maljkovi? | Used under a Creative Commons Attribution Share-alike license