Why do Christians no longer take foods seriously?
I'm sure reasons vary. For us knowing He said when He sent them out to "Eat what is set before you" gives us a different perspective of the importance of it. Then too, this passage from Matthew 15:10 -20
10And he called the multitude, and said unto them, Hear, and understand:
11Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man.
12Then came his disciples, and said unto him, Knowest thou that the Pharisees were offended, after they heard this saying?
13But he answered and said, Every plant, which my heavenly Father hath not planted, shall be rooted up.
14Let them alone: they be blind leaders of the blind. And if the blind lead the blind, both shall fall into the ditch.
15Then answered Peter and said unto him, Declare unto us this parable.
16And Jesus said, Are ye also yet without understanding?
17Do not ye yet understand, that whatsoever entereth in at the mouth goeth into the belly, and is cast out into the draught?
18But those things which proceed out of the mouth come forth from the heart; and they defile the man.
19For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:
20These are
the things which defile a man: but to eat with unwashen hands defileth not a man.
We avoid pork as in don't raise or purchase it, but if we are eating at someone else's place or miss it at a potluck, we don't stress about it or throw it away.
I find the man made chemicals, herbicides, pesticides, and ultra refined (so called) foods far more dangerous to health and well being.