Washing hair every 2 days might work for folks who have dry hair and dry skin.

It doesn't work for me at this time since I seem to still have enough oil in my hair that my hair ends don't dry up or my scalp doesn't get dry. I do sufficient exercise nearly every day that it does help me to wash (and shower) daily. When I was younger (ie teenage) washing my hair every day was healthier for my skin since I broke out in acne. The trick for me, is not use overly hot showers too often.

I don't colour nor perm my hair so the drying out of hair from daily washing is less of an issue.
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