People with hypothyroidism may want to consider minimizing their intake of gluten, a protein found in foods processed from wheat, barley, rye, and other grains, says Ruth Frechman, RDN, a dietitian and nutritionist in the Los Angeles area and a spokesperson for the Academy of Nutrition and Dietetics.
Yellow Nails. One of the most common causes of yellow nails is a fungal infection. As the infection worsens, the nail bed may retract, and nails may thicken and crumble. In rare cases, yellow nails can indicate a more serious condition such as severe thyroid disease, lung disease, diabetes or psoriasis. Swipe to advance.
Yellow nails can also be caused by any of the following: 1  frequent application of nail varnish. 2  lymphoedema â a long-term condition that causes swelling of the skin. 3  permanent damage to your airways caused by bronchiectasis â a long-term lung condition.  sinusitis â inflammation of the lining of the sinuses.