http://perfecthealthdiet.com/2011/01/why-we-get-fat-food-toxins/not a long article but here is the conclusion Certain toxic foods seem to be very effective at causing obesity:  vegetable oils, fructose, and wheat. Along with malnourishment (for instance, by choline deficiency) and infectious disease, food toxins are why we get fat.The first step in any weight loss effort, therefore, ought to be removal of these toxic foods from the diet. Removing these toxins may not cure obesity; but without this step a cure is unlikely.