I think it's possible that the Lord's blessing will remove the harm of eating XYZ but once you know a food is poison then you are tempting the Lord.

Jesus made a plum tree shrivel up and die because it did not produce any (good) fruit.

Mat 21:19 KJV And when he saw a fig tree in the way, he came to it, and found nothing thereon, but leaves only, and said unto it, Let no fruit grow on thee henceforward for ever. And presently the fig tree withered away.

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The same goes for a false prophet and bad fruit...

Mat 3:10 KJV And now also the axe is laid unto the root of the trees: therefore every tree which bringeth not forth good fruit is hewn down, and cast into the fire.

Mat 7:15-20 KJV ¶Beware of false prophets, which come to you in sheep’s clothing, but inwardly they are ravening wolves.

16. Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles?

17. Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit.

18. A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.

19. Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.

20. Wherefore by their fruits ye shall know them.

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