Any part of the egg can harbor bacteria, and both whites and yolks have been implicated in food-borne illnesses (e.g. salmonella), however, the yolk is the most common source, according to the USDA. Egg yolks are also a source of dietary cholesterol, the bad type.

Allergy is one reason why an individual may opt for a soy-free diet. Food allergies involve the body’s immune system. Moreover, the phytoestrogens present in soy bind to estrogen receptors and exert both estrogenic and anti-estrogenic effects, phytoestrogens can inhibit thyroid peroxidase, the enzyme responsible for converting T3 to T4 (the exact clinical consequences of this are unknown, but several reports attribute thyroid cancer and goiter development to soy intake).

A diet focused on natural, organic food is essential to maintaining a healthy body, but the majority of food is laced with preservatives to make it last longer on supermarket shelves. Some of these preservatives may harm you when eaten in large quantities, explains the Center for Science in the Public Interest.