Food science expert Dr Stuart Farrimond says intelligent and imaginative people go for the Half Mooner method, taking just two bites to eat one.
The Scoffer who shoves a Jaffa into their mouth whole, reveals a talkative, sporty and energetic personality.
The Jelly Lover, who heads straight to the centre of the cake, is seen as kind, sympathetic and affectionate.
And the All Rounder, nibbling around the edge first, shows a determined, organised and thorough type.
Dr Farrimond found 35 per cent of Britons are Half Mooners while 28 per cent are All Rounders, 20 per cent are Scoffers and six per cent are Jelly Lovers.
All Rounders have the right technique for maximum Jaffa Cake pleasure.
Dr Farrimond said: “Given that the orange jam layer is pooled in the central segment of the Jaffa Cake, this can only be fully appreciated by nibbling the edge off first and then eating the middle portion alone.”
The research was commissioned by Jaffa makers McVitie’s.