How do you know what type of fats you should be eating? Polyunsaturated/monounsaturated (nuts, seeds, avocado, olive oil), or saturated fats (meat, dairy)? You can learn which fats are most likely going to benefit you by understanding your genes.
Someone who has a specific gene mutation in the PPAR gamma gene would likely want to stay away from specific types of fat. I personally have the (C;C) genotype, which means chances are I'll be fine eating any of the fat types. When individuals with the(C;G) or (G;G) genotype eat a diet high in saturated fat but low in polyunsaturated and monounsaturated fat, their risk for obesity and type 2 diabetes is increased. However, if these individuals consume a diet higher in mono- and polyunsaturated fats and lower in saturated fats, their risk for obesity and type 2 diabetes is normal. That's crazy huh?!
This is just one single gene variant that can help determine your food choices, and even more so, your potential health outcomes because of those choices. Understanding your genes and personalizing your nutrition is called nutrigenomix, and this science is changing the game!