Oh yes, I definitely have brittle nails. A few months ago I stopped wearing fake nails from the manicurist and my finger nails survive moderately well, however my toe nails are a different story. Super thin whereas they used to be extremely thick.
I wonder if bumping into things is part of it as you mentioned. Most of the time it doesn't even hurt or phase me when I bump into things. Suddenly I'll find a new bruise and wonder how on earth it got there because I won't even remember.
You mention you take so much, do you mean essential fatty acids?