We shouldn’t trust health studies that let people report what they ate

Every time I read a health study that trusts people to report what they ate, I want to throw the paper in the trash. People are not to be trusted, and self-reporting is inaccurate to the point of nearly being useless. I know this from personal experience: I was part of a two-year, nationally funded weight-loss study. All they asked of me was that on one day about every six months, I tell them what I ate the day before. I went in with good intentions — well, you know what they say about tho