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Too much vegetable oil? Your ratio of Omega-3:Omega-6 fatty acids will be out of whack, causing inflammation in the body.

Too much soy? There are plenty of PubMed studies that cite soy's effect on hormones and the estrogenic activity that it can cause.

It seems to come down to balance.

Vegetable oil isn't especially healthy, but sunflower oil isn't unhealthy compared to the fats in a burger.

Most studies looking at soy's effect on the body find a positive or neutral effect. Only a few(mostly in vitro) studies show the opposite.