Crab fillet, chicken fillet, pork fillet, beef fillet ... these foods may not be from real materials. Similarly, it is just seasoning and imitating the taste. Crab fillet, that is, crab stick, is usually made of minced fish.
It has been exposed that some unscrupulous merchants pretend to be "beef tenderloin" with duck meat. If you find beef tenderloin with very cheap price and tender taste, you should be vigilant. In order to achieve a better taste, pork chop patties, which are often used to make hamburger meat, generally add extra fat and starch.
Chicken itself is a healthy choice, but if it is made into fried chicken fillet, which is common in streets and lanes, it will be unusual. On the one hand, it is covered with thick starch, on the other hand, it will suck in a lot of oil after frying. This bite is not only delicious, but also unhealthy!
It's not that foods with these four words are absolutely inedible, but that these foods are not particularly "healthy". It is ok to treat your mouth occasionally, but it is not recommended to eat it often or in large quantities.
Food and health can be balanced, depending on how you balance them.