Fiber
Yeah, I'm not a big fan of the automatic goals from MFP so I manually set mine. I guess in theory you could get too much fiber but have never heard of someone actually consuming too much. Maybe if you were doing suppliments AND ate a high-fiber diet... My NUT told me not to log my Metamucil as the extra calories from that fiber don't really add up to much and as long as I'm pooing daily, I'm doing good. When the system starts slowing down, that's when I up the fiber intake. Just creates a bit more gas, but that's what GasX is for!
First ultra: Stone Mill 50 miler 11/15/14 13:44:38, First Full Marathon: Marine Corps 10/27/13 4:57:11, Half Marathon PR 2:04:43 at Shamrock VA Beach Half-Marathon, 12/2/12 First Half-Marathon 2:32:47, 5K PR Run Under the Lights 5K 27:23 on 11/23/13, 10K PR 52:53 Pike's Peek 10K 4/21/13, (1st timed run) Accumen 8K 51:09 10/14/12.
A quick Google search shows "How much fiber do you need? Women need 25 grams per day and men should get 38 grams per day, according to an Institute of Medicine formula based on getting 14 grams of fiber for every 1,000 calories." from webmd.com.
Warning: dramatically increasing your fiber intake will result in "gastrointestinal distress" for a month or so. It goes away once your guts get used to it, but it can be pretty miserable for a while.