Food labels a trap????

I have noticed people studying the labels on food products before buying them. But can we really rely on the information labeled there?
Do you know the labels on these food products can be deceiving in a way that when they labeled it as low fat, people tend to overindulge in eating more than they should? Someone we know who is on low salt diet. But just because the label says low salt, more salt were sprinkled onto the food. I am sure you have seen people doing that. Just because the label says Fat Free, people tend to eat more of it.
Remember your intake even it is labeled fat free, low fat, low salt etc.... when you eat more than you should, it equals to the same amount of the food that you were trying to stay away from.
So if you want to be true to your diet, eat moderately and don't overindulge !