The trans fat that is listed on the back of the yogurt is more than likely the naturally occurring Conjugated Linoleic Acid (CLA).
Disregard what the "board certified nutritionist" states as he has discredited his very profession and personal knowledge by stating what he did in his very first post, but CLA is found in abundance in grass-fed beef, dairy, and other ruminants. It has significant anti-cancer properties among other attributes that are positive to health.
But do not go out and buy "CLA" supplements though :)