Aside from other health concerns associated with eating fish with traces of mercury, mercury interferes with your body’s ability to absorb zinc.
A zinc deficiency can cause your hair to thin and fall out.
Alcohol
You know how when you’ve had too much to drink, the next morning you wake up with a pounding headache, desperate for a glass of water?
That’s due to dehydration, and your hair feels the same way after a night on the town.
Drinking too much alcohol causes your hair to lack moisture, which can make it brittle and breakable.