FTO and obesity due to melanocortin 4 receptor deficiency: Also the previous contradictory results on the relationship of dietary patterns with obesity may be due to the modifying effect of FTO polymorphisms, so we performed this prospective study to find out the interaction of DASH and HEI scores with FTO polymorphisms in isolation or in a combined form genetic risk score (GRS) concerning change in obesity traits among adult Tehranian participants.