YSK in the US foods can be listed as TRANS FAT FREE and containing 0g trans fat and STILL CONTAIN TRANS FAT. If you see the word hydrogenated or partially hydroganted oils under ingredients, it contains trans fat.
from /r/YouShouldKnow
在美國，YSK的食品可以被列爲不含反式脂肪，並含有0克反式脂肪，但仍然含有反式脂肪。如果你看到成分下有氫化油或部分氫化油的字樣，則含有反式脂肪。