It would be really dumb to lie when they don't need to. For example, one of the claims I've heard by a dairy industry representative is that Dr. T Colin Campbell's China Study supports the health benefits of milk. It's true, there are about 2 pages of supportive data out of the several thousand pages in the study report. Dr. Campbell has personally changed from eating a standard western diet to a dairy free diet. Apparently those two pages didn't impress the author of the report. When the positive milk results were pointed out to him, he said that he wished the dairy industry would pay attention to some of the other results in the study. You can cherry pick just about any study. Another technique that they use is to fund a large number of studies. If a study comes out positive, they publicize it. If it looks like it will come out negative, they try to kill the study before it is completed. If they can't kill it, then they certainly will not publicize it. And any researcher who comes out with a negative study will certainly never receive any more funding from the dairy industry. They don't have to lie. They just present an unbalanced view of the results.
I presume you are joking. Unfortunately, tone of voice does not come through a keyboard. Advertising is mostly lies, with a thin veneer of deniability, backed up by pig pens full of lawyers to prove in court that black is white and down is up. The only really honest advertising are those grocery store fliers that tell you the price of grapefruit and canned pumpkin this week.