I think it's worth understanding why someone is a 'veggie'. For me it was for standard 'moral' reasons and so eating junk food is still acceptable. Eventually

I think it's worth understanding why someone is a 'veggie'. For me it was for standard 'moral' reasons and so eating junk food is still acceptable. Eventually I picked up the health reasons angle (and discarded all the junk food) and moving to mostly a plant based diet (mostly vegan).