On an individual level this means that the part of losing weight include the ability to get rid of toxins that will be released back into the bloodstream as fat is broken down. This means that detox the system (liver, lymph, and digestion) have to work during weight loss or weight, or it will be difficult to lose or actually dangerous to lose. In fact, hitting the "toxic fat layer" is often a reason for not being able to start losing weight in the first place, hitting a plateau, weight loss, or not being able to get rid of that last 5 pounds.
While the pollution and toxins are not the only reason why people are overweight, it is part of the overall problem and a very important part for anyone struggling with weight loss or has a history of yo-yo dieting. Understanding these issues and deal with it if necessary is an important part of healthy weight management strategies.