Deception in various forms was incredibly common in U.S. studies when I was majoring in psych. Even if you didn't say anything like "We're studying weight loss

Deception in various forms was incredibly common in U.S. studies when I was majoring in psych. Even if you didn't say anything like "We're studying weight loss" when actually you were studying anxiety, you might just not talk much about what the study is about while including tasks that lead people to naturally think the study is about X when really it's about Y.