Your liver has two main functions: filtering toxins and processing fat. Just like a man with two jobs, the more time you spend doing one, the less time you spend doing the other. So, if we constantly give our bodies toxins the liver has to filter then it has little time to process and get rid of fat. Hence, we reduce our bodies ability to burn fat.
Now, when I use the word toxins that refers to anything that your body cannot process. If you look at the label and see a lot of chemicals, even when it is "health" food. Your body cannot use or process it. This stuff has to be filtered through the liver! That includes preservatives used in canned foods! Don't be surprised but even items like soy products and whole wheat bread are extremely processed. Also, anything with artificial sweeteners, no matter how healthy it may seem, can be put into this category.
Now, how do you beat this without having a PhD in nutrition? Try eating fresh food made of one thing like broccoli, steak, chicken, and rice. You can combine these foods to make healthy meals. One great example is a hamburger made out of 100% ground beef, lettuce, onion, tomato and 100% grain bread.
Now, I will say that, in this day and age, it is extremely difficult to totally rid yourself of processed food. However, when you can, avoid them! In my own diet, to maintain muscle mass, I use protein powder which definitely has some portions that cannot be processed. However, the rest of my day consists of eggs, lean meats, fresh veggies and some fresh fruits.
Finally, you can't say that you will start eating none processed food and forget all the other tenants of healthy eating but this is great place to start changing your lifestyle! You may ask, how do I know it works? Well, hours of reading don't hurt, and, second, experience! Not only for myself but for quite a few others who listen to recommendations from Team SideMeat!