According to Fred Ackerman, an economist at Tufts University, «Cost - benefit analysis requires definite numbers on each side of the balance sheet, to allow the comparison of costs and benefits. (foe.org)
This is likely due to low amounts of mineral blocking phytic acid, although I was unable to find definite numbers on this to confirm. (thehealthyhomeeconomist.com)
Add numbers: Upworthy's post was shared over 1.6 million times on Facebook because it has a definite number. (neilpatel.com)