After studying the why's of God's requirements for Israel (as if I could understand God's whys) and being reflective on today's problems with food sources, I generally abide by these rules for myself:

No pork, no shellfish, no fish without scales ....

In the New Testament God tells us all things are lawful but all things are not expedient. I believe that includes foods...as His revelation to Peter shows.

I understand the no pork or shellfish because they are the scavenger's of the earth/waters. Of course there is a commandment about cloven foot vs non cloven foot animals. I won't eat dog, btw. (Pigs have no sweat glands and thus all toxins remain in the meat. Mollusks etc are bottom feeders, scarfing up the dung of the other life. And did you know shrimp are also canabals? And "fish without scales" includes such as eels and porpoises.

In today's market, it's hard to find really clean/pure fish. Even if you buy through a farm, they are usually fed growth hormones etc. Fresh fishes often have high levels of things not suitable for me to ingest

I do eat limited meat... angus beef only (with no additives in foods,no antibiotics? no hormones etc) and perdue chicken (only) for the same reasons. But I can also become ill if the Perdue chicken is very yellow...I think I'm allergic to the type of they allow to get that effect. But hey, I have to eat only orange-blossum honey, due to my allergies of general weeds

Eggs don't like me, even free range, though I haven't had my own chicken in many a year

I truly love vegetables! I could eat a salad 3 times a day... but don't