What would make your hair and nails all of a sudden start to grow rapidly? There has been no change in diet.

One reason for sudden hair and nail growth could be due to
an improvement in your overall health.  There are many vitamin deficiencies that can
cause your hair and nails to grow slowly.  Sometimes these vitamin deficiencies are due
to underlying medical conditions that may have resolved
themselves. 

Some of the important vitamins for hair and
nail health are vitamin C, vitamin E, and B-Complex
vitamins.

One condition that can be difficult to pin down
medically is thyroid disease.  This illness presents with many random symptoms that make
detection a drawn out process.  Some of the symptoms of this are slow growing hair and
nails.

Always keep in mind that your hair, nails, and skin
are key indicators of overall health.  If you ever have concerns I would recommend that
you see a medical professional.