In the old days, they'd simply take a couple of people who looked similar, one simply being fitter than the other. However, as stupid as people are in general, they stopped buying this. Nowadays, if you do this, you run the risk of being sued for false advertising, etc. No one does 'the people switch' anymore for this reason.
Now, if a company wants to make gains seem more real, they simply find a fit person, get that person to eat, then pose poorly with gut sticking out in the before pictures, then pay them to work out and lose that weight. Then they slap a smaller, tighter pair of trunks on that man, get him to smile (as opposed to the typical depressed look in the before), and hit a muscular pose. This makes the difference look huge.
However, when dealing with EAS BFL pictures, they are real. Anyone who has watched the Body For Life video knows that they are dealing with real people and real pictures. In fact, when you enter the EAS contest, there are a variety of rules, and if you are selected to be one of the finalists, you must undergo tests for steroids and other substances. The EAS site probably has the complete rules. EAS has had a long-standing good reputation in the industry and those pictures are real.
Notice also in many weight-loss product ads the phrase "these results are not typical, your results may vary". According to the Hydroxycut ads, typical loss is like 8.8lbs in 8 weeks. That isnt an earth-shattering difference. In the EAS contest you've got 12 weeks, plenty of time to do DNP, Clen, etc. if you wanted...
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