officially its a Spit test...

However, for the B-Type Diet: if you follow the Secretor version and you feel unwell after several months - try the nonsecretor version. this is one Blood Type where there is some good differences between Secretor and Non-Secretor.

Me, as I've fasted various times, and really conscious of what foods make me feel well, the Non-secretor version of B-type diet made the most sense...and I confirmed it.

All Secretor means (More than 80% of the population is) is that when you salivate or perspire you have genetic material in the fluid. Non-Secretors don't. Tweet