Astro,
i dun care.. cos i love dao-you.. especially those chicken rice stall type. and I always take. i realised that if it's that kind of good dao-you, then i think no allergy leh.. but if those not so good quality, then will kena! hahah.. but anyway, it's my guess only.. maybe it's not even the soy sauce.. also, I read before, some allergies (like mine i believe), it's not always the same food or situation will cause it. Food A maybe be ok, but if Food A + Food B combine, then may cause the reaction.. by itself, both A and B may be ok.. so it's very hard to pinpoint. so I never bother.. cos my allergy is under-control now.. meaning, even if i get it, it's very mild now.. just a few dots puff up around my eyes.. some years back, when it first started, it's very bad.. i get all swollen and wheezing.. now not so big reaction liao.