DONT EAT ONION,GARLIC,DRUMSTICK,RADDISH,EGG & DRINK COFFEE,TEA.IF YOU EAT THEM,punarupanayanam must be done! i.e. once again sacred thread ceremony must be done as expiation(prayashchitta) according to dharma shastras.and panchagavya must be drunk to purify yourself .So,be careful!
If you eat them you will lose your brahmanatvam.
Shatathapa smrithi says:
"LASHUNAM KRINJANAM PALANDUM CHA THATAH DVIJA:|USHTRA MANUSHABHASHVARASABHA KSHERA BHOJANATH|| UPNAYANAM PUNA: KAARYA THATHVATH KRUCHRAM CHARAN MUHU:"
WHICH MEANS ,
If a brahmana eats garlic,onion and drinks the milk of camel,human,elephant,horse & donkey he should do thaptha kruchram and perform punarupanayanam।