Who trust government data? Anybody who uses a USGS map. Or a weather forecast that uses satellite data. Or who uses a GPS (both the satellite signal and the base map, which is compiled by private companies from government sources).
Now any statistic is capable of misleading, if you choose to misinterpret it. Take unemployment. I think that figure is accurate, it just doesn't mean what people think it does. By 2016 unemployment had recovered to where it was before the Great Recession, but if you think that means the government is fraudulently telling you that the job picture is good, that's you misinterpreting what it means. The low unemployment rate masks (a) relatively low labor participation and (b) disastrously low job growth and labor participation in certain regions of the country -- particularly rural and small to middle-sized cities. How do I know this? Well, government data, obviously.
You are conflating "data", with "information" and "opinion". The Food Pyramid is opinion, not data. If you think for yourself and drill down into the facts a bit, you'll find that government data is pretty useful. Opinions, less so.