Even though we mentioned that if someone stole food, a blessing may not be recited over such food, before eating it or after eating it, this does not fully apply to bread. If someone stole bread, or even stole wheat and ground it and baked it, he must not say the Berakha (blessing) before it. However, Birkath HaMazon, which is a Torah commandment (and in a case of doubt we must take the strict approach), must be recited.
Obviously one may not give forbidden food to another Jew. But this does not just apply to food that is not Kosher and may not be eaten by anyone. It also applies to foods which the other person may not eat because he made a Neder (vow) not to do so. If the food is dangerous for him, perhaps on account of a health issue, one may not feed it to him either.
All this applies, even if the other person requests it. And in all cases, if they did eat this food, they may not be included in the Zimmun for Birkath HaMazon and a blessing should not be recited. In the case of the stolen bread, even though he is reciting Birkath HaMazon, he should first have in mind the desire to repent and should reimburse the loss to the owner.
(See Kaf Hahayyim 196:2, 6)
kaf hachaim, kaf hahayim, giving forbidden food to another Jew, giving dangerous food